Poker: Bluffing can be effective

The hand that you’re holding is one thing. The hand that you can make your opponent believe you’re holding is another.

AMERICAN AIRLINES - In Hold'em, a pair of Aces in the hole. Better known (at least in rec.gambling) as POCKET ROCKETS.
BACK DOOR - Applies to a hand that was made in the last card or two, specifically not a hand the player was originally planning on having. Most often applied to straights and flushes.
FORCED BET - In some stud games a player may be required to make a bet to start the action on the first card. This is similar conceptually to blinds and antes, but in this case is dependent on the cards shown rather than player position. Usually the weakest hand is forced to bet.
PROP - Also PROPOSITION PLAYER. An employee of the gaming establishment whose primary purpose is to keep enough players at a table to prevent breaking up the game for lack of players. Unlike SHILLs "props" make a small hourly wage but play with their own money, winning or losing based on their skill.
TOURNAMENT - A highly structured game involving potentially dozens of tables where all participants pay an entry fee and obtain a fixed number of chips. Once a tournament has started, additional players may not enter. As the game progresses players bust out and are eliminated until only one winner remains.
LOWBALL - Generic term for poker where the lowest hand wins.

Poker Information