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Keep Them Honest
• To call at the end of a hand to prevent someone from bluffing frequently.

Key Hand
• In a session or tournament, the one hand that ends up being a turning point for the player, either for better or worse.

Kicker
• The highest unpaired side card in a players' hand.

Kill Button
• A button used in a kill game to indicate a player who has won one pot. If the player wins a second pot in a row, a kill game begins.

Kill Game
• A special rule in some games. If one player wins two pots in a row, all blinds & minimum required bets are doubled in the next hand. The player who won the two previous hands must also put in a big blind (doubled). The game stays at these raised limits until that person loses a hand.

Knock
• To check. Refers to players who knock their knuckles on the table rather than say "check".

Kojak
• A hand that contains a K-J.