Bad beat -- A particularly unlucky way to lose a hand, especially a big one, usually involving an unlikely draw by an opponent on the last card (also known as "the river").
Blinded off -- When you lose your last chips in a tournament because you have to pay either a small or big blind. In some kinds of poker -- notably hold 'em -- the player to the left of the dealer has to post a bet called the small blind, and the player to the left of the small blind has to post another bet (usually but not always twice the size of the small blind) called the big blind before they are dealt a hand. The purpose of the blinds is to get the betting started (similar to antes in, say, seven-card stud) and, more important, to prevent players from endlessly folding until getting the best possible hand, which is A-A. In a tournament, the blinds increase at regular intervals, encouraging the play of less-than-optimal hands, which, in turn, prevents tournaments from going on forever.
Final table -- The last table left at a tournament, usually nine people in hold 'em events, though some televised tournaments, such as World Poker Tour championships, only seat six.
Flop -- In hold 'em, there are four betting rounds -- after each player is dealt his/her two down cards, after the first three community cards are dealt face up in the middle of the table, after the fourth community card is dealt face up in the middle of the table, and after the fifth and last community card is dealt face up in the middle of the table. The first group of three community cards is known as "the flop." (The fourth community card is known as "the turn" or "fourth street," and the fifth as "the river" or "fifth street.")
Position -- On any hold 'em hand, where a player sits in relation to the dealer. The first few players (usually the first three or four) to the left of the dealer -- that is, the ones who have to bet first -- are in early position. The next three or so are said to be in middle position, and the last three or so are in late position.
Add-on -- In a rebuy tournament (that is, a tournament where, for a specified period of time, you can buy more chips if you go broke -- or, in some cases, go below a predetermined level), when the specified rebuy period is over, you can buy more chips -- usually either the same amount you started with or twice that number, which is, of course, a double rebuy. Some tournaments, such as the Tuesday night no-limit hold 'em tournament at Foxwoods allow, under certain circumstances, triple and even quadruple rebuys.
Middle suited connector -- Suited connectors are two cards of the same suit that are also contiguous in denomination, such as the 9-10 of clubs. Examples of middle suited connectors would be 6-7, 7-8, 8-9, 9-10 and 10-J.
Overcard -- In hold 'em, any community card higher than either card in your hand. For example, if you have Q-Q in your hand, a king or an ace on the board would be an overcard.
Side pot -- A second pot for the other active players when one player is all-in and has nothing left with which to match additional bets.
Case ace -- The last ace left in the deck. Can apply to any numeric card or suit -- for example, "I don't believe he pulled the case heart on the river," refers to the last heart left in the deck.
Lammers -- Chips that can only be used to enter tournaments and other events sponsored by the casino issuing them. (The ones I won came in $100 units, which means they can be used for any Foxwoods poker event that cost $100 or more to enter.)
Outs -- The number of cards left in the deck which, if they show up, will make your hand a winner. For example, in hold 'em, if you have K-Q of diamonds in the hole, and the flop comes A-J-4 with two diamonds, and your opponent's hole cards are 9-9 (neither a diamond), you have 19 outs -- any of the nine remaining diamonds for a flush, any of the four 10s for a straight and any of the six remaining kings and queens for a higher pair.
Pair the board -- When two cards of the same denomination show up among the five community cards, whether on the flop, the turn or the river.