M'MIDDLE PAIR - Making a pair of the second to highest card on the board.
MIDDLE POSITION - When a player's turn to act is somewhere in the middle of the round.
MISCALL - When the ranking of a hand is announced incorrectly.
MISDEAL - An error in the cards' dealing, which is big enough to cause a totally new dealing of the cards.
MISSED BLIND - A blind bet that a player forgot to make.
MUCK - A stack of "rejected" cards, pilled on the table by the dealer, all facing down.
MUCKING - Throwing away a hand.
MUST-MOVE - In order to protect the main game, a situation where the players of a second game must move into the first game as openings occur.
N'NO-LIMIT - A game which places no fixed limitations on the maximum bet made, allowing a played to bet all his money at once, if he chooses to do so.
NUTS - The finest hand a player can have.
O'OPENER - The player that placed the first bet (which wasn't a mandatory bet.)
OPENER BUTTON - A round disk used in draw poker, which shows which player opened a specific round of bets.
OPENERS - In jacks-or-better draw, the cards held by the player who opens the pot that show the hand qualifies to be opened. Example: You are first to bet and have a pair of kings; the kings are called your openers.
OPTION - when a player with a blind can choose whether to raise or no.
OUTS - Cards that can help a hand to win the pot.
OVERBLIND (Or OVERSIZED BLIND) - A blind bet which is larger than the big blind. Helps to increase the pot.
OVERCARD - A card facing down, which is stronger than the rest of the cards on the board.
OVERPAIR - A pair of two cards facing down, which are stronger than the rest of the cards on the board.