A

Ace-High

A five card hand that contains one Ace, with no straight or flush or a hand with no pair in it.

Aces Full

A full house with three aces and any pair.

Action

Checking/Betting/Raising. A game in which players are playing a lot of pots is considered an "action" game.

Active Player

Any player who is still in the hand.

Add-on

A purchase of more chips (optional) at the end of the re-buy period in a tournament.

Aggressive

Adjective to describe a player who raises and re-raises and rarely calls.

All-In

When a player bets all their chips.

American Airlines

Two Aces.

Ante

Money placed in the pot before the hand is begun

Ante Up

Put one's ante in the pot.

B

Bad Beat

When a player holding a very good hand is beaten by a hand that is statistically very unlikely.

Bankroll

The amount of money you have.

Bet

To place chips into the pot.

Big Blind

A designated amount that is placed by the player sitting in the second position, clockwise from the dealer, before any cards are dealt. (Players joining a game in progress must post a Big Blind, but may do so from any position.)

Bluff

A common poker strategy where you deliberately and heavily over bet your hand in an effort to make your opponents think it is better than it actually is.

Boat

A full house.

Bottom Pair

When a player uses the lowest card on the flop to make a pair with one of his own cards.

Bullets

A pair of Aces. 

Button

Also known as the dealer button, it is a small round disk that is moved from player to player in a clockwise direction following each hand, to theoretically indicate the dealer of each hand.

Buy-In

The minimum amount of money required by a player to sit down in a particular poker game.

C

Call

Matching a bet amount.

Check

When it's a player's turn to act and there has been no action in front of them and he opts not to bet, he "checks."

Check-Raise

When a player first checks and then raises in the same betting round.

Community cards

Cards that are turned face up in the middle of the table, and which belong to all players still in the hand. Community cards are used in Hold 'em and Omaha.

D

Dealer

The person who handles the cards , gives out the pots, and monitors the game.

Deuces

A pair of Twos.

Disconnect Protection

A tool to protect players in the event that their internet connection is lost while involved in a pot.

Down Card

Hole cards. Cards that are dealt face down.

Doyle Brunson

It's a Holdem hand consisting of a 10-2 (Brunson won the world championship two years in a row on the final hand with these cards).

E

Early Position

Position on a round of betting where the player must act before most of the other players at the table. (This is considered the two positions located to the left of the Blinds.)

F

Fifth Street

Also known as the "river" card. In flop games, this represents the fifth community card on the table and the final round of betting. In Stud games, this is the fifth card dealt to each player and represents the third round of betting.

Flop

In Hold'em and Omaha, the first three community cards that are dealt face-up in the center of the table all at one time. The "flop" also indicates the second round of betting.

Flush

Any five cards of the same suit.

Flush Draw

When a player has four cards in his hand of the same suit and is hoping to draw a fifth to make a flush.

Fold

To throw your hand away when it's your turn to act.

Four of a Kind

Four cards of the same number or face value ("quads").

Fourth Street

In flop games, it is the fourth community card dealt (also known as "the turn") and represents the third round of betting. In Stud games, it is the fourth card dealt to each player and represents the second round of betting.

Full House

Any three cards of the same number or face value, plus any other two cards of the same number or face value.

G

Gut Shot

To draw to and/or hit an inside straight.

H

Heads-Up

When only two players are involved with a hand.

High-Card

To decide the first dealer in the flop tournaments each user is dealt a single card and the player with the highest card (based on the card and the suit order - of spades, hearts, diamonds & clubs) becomes the theoretical dealer.

High-Low

Split pot games. 

Hole Cards

These are the Down Cards in front of the players.

I

Implied Odds

The odds you are getting after the assumed result of betting for the remainder of the hand.

Inside Straight

Four cards which require another between the top and the bottom card to complete a straight. Players who catch this card make an Inside Straight.

J

Jackpot

A prize fund awarded to a player who meets a set of predetermined requirements. For example, some casinos will give a jackpot to someone who gets four-of-a-kind or higher and loses.

K

Kicker

The highest unpaired side card in a players' hand.

Kill Pot

A method to stimulate action. It is a forced bet by someone who has just won a pot(s).

L

Ladies

Two Queens.

Late Position

Position on a round of betting where the player must act after most of the other players have acted (usually considered to be the two positions next to the button).

Lay Down Your Hand

When a player folds.

Limit Poker

A game that has fixed minimum and maximum betting intervals along with a prescribed number of raises.

Loose

Is a player who plays a lot hands.

M

Main Pot

The center pot. Any other bets are placed in a side pot(s) and are contested among the remaining players. This occurs when a player(s) goes all-in.

Middle Pair

In flop games, when a player makes a pair with one of their down cards and the middle card on the flop.

Middle Position

In flop games, when a player makes a pair with one of their down cards and the middle card on the flop.

Muck

To discard or throw away your hand. It's also a pile of cards that are no longer in play.

N

No Limit

A game where players can bet as much as they like (as long as they have it in front of them) on any round of betting.

Nuts

The best possible hand at any point of the game. A hand that cannot be beat.

O

Odds

The probability of making a hand vs. the probability of not making a hand.

Offsuit

Cards of a different suit.

On the Button

Being the last player to act in a betting round. Dealer's Position.

Outs

The number of cards left in the deck that will improve your hand.

Overpair

A pocket pair higher than any of the cards on the board.

P

Paints

Face or picture cards (Jack, Queen and King).

Pair

Two cards of the same face or number value.

PocketCards

The two cards dealt to you at the beginning of a Hold 'Em hand that no one else is entitled to see.

Pot

The money or chips in the center of a table that players try to win.

Pot Limit

This is a game where the maximum bet can equal the pot.

Q

Quads

Four of a kind.

R

Raise

To increase the previous bet.

Rake

Chips taken from the pot by the cardroom for compensation for hosting the game.

Re-buy

The amount of money a player pays to add a fixed number of chips to their stack in a tournament.

Re-raise

To raise a raise. Ring Game
A "live" game that is not a tournament.

River

This is the last card given in all games. In Hold'em and Omaha, it is also known as 5th street. In Stud games, it is also known as 7th street

Round of Betting

This is when players have the opportunity to bet, check or raise. Each round of betting ends when the last bet or raise has been called

Royal Flush

This is an Ace high straight (A-K-Q-J-10) of the same suit. It is the best possible hand in poker.

S

Satellite

It is a mini-tournament to gain an entry into a larger tournament.

Seventh Street

This is the final round of betting in Seven Card Stud and Stud 8 or Better.

Showdown

At the end of the final betting round, it's when all active players turn their cards face-up to see who has won the pot.

Side Pot

A separate pot(s) which is contested by remaining active players when one or more players are all-in.

Sixth Street

In Seven-card Stud, this is the fourth "up" card dealt to the player (their 6th card). It is also the 4th round of betting.

Small Blind

The amount put in the pot by the person immediately to the left of the dealer "button" prior to the cards being dealt.

Stack

A pile of chips.

Straight

Five consecutive cards of any suit.

Straight Flush

Five consecutive cards of the same suit.

Structure

The limits put on the blinds/ante, bets, and raises in any particular game.

Suit

A characteristic of a playing card. The card being either of Clubs, Diamonds, Hearts, or Spades.

T

Tell

An action that gives clues about the cards someone is holding.

Tight

A player who doesn't play many pots. A tight game is one that doesn't have much action

Top Pair

In flop games, when the player pairs one of his down cards with the highest card on board.

Trips

Three of a kind.

Turn

In flop games, this is the fourth card dealt. It is the third round of betting.

Two Pair

A hand consisting of two different pairs.

U

Under the Gun

Being the first person to act, being in the earliest position.

Underpair

A pocket pair of lower value than the lowest card on the board.

Up Card

A card that is dealt face-up.

V

Value
As in "bet for value." This means that you would actually like your opponents to call your bet (as opposed to a bluff). Generally it's because you have the best hand. However, it can also be a draw that, given enough callers, has a positive expectation.
Variance
 A measure of the up and down swings your bankroll goes through. Variance is not necessarily a measure of how well you play.

W

Walking Sticks

A pair of sevens.
WHITE BLACKBIRD
A hand so astonishingly rare as to be unworthy of the opponents' consideration, e.g., being dealt a pat royal flush in 5-card draw.

Wild Card

A card that can be played as any value.

Winning Hand

A winning hand is one that you get paid for. For most video poker games the lowest winning hand is a Pair of Jacks. In Deuces Wild Video Poker, it's Three of a Kind.

WSOP

World Series of Poker.

Z

Zilch or Zip

Nothing. A dealt hand with no cards worth holding (i.e., you should redraw all five cards) or a final hand with no payoff. Also called a garbage hand.

 

WHITE BLACKBIRD n. A hand so astonishingly rare as to be unworthy of the opponents' consideration, e.g., being dealt a pat royal flush in 5-card draw.