| Odds | The probability of making a hand versus the probability of not making the hand. |
| Offsuit | Two different suits, used to describe the first two cards. |
| Omaha | A flop game similar to Hold 'Em, but each player is dealt four cards instead of two, and a hand must be made using exactly two pocket cards, plus three from the table. |
| On Board | On the table; in the game. |
| On The Come | A hand that is drawing to a straight or flush. |
| On Tilt | Playing poorly, usually because of becoming emotionally upset. |
| One-Gap | An inside straight. |
| Open | To make the first bet. |
| Open-Ended Straight | Four consecutive cards requiring one at either end to make a straight. |
| Open Card | Exposed card; a card dealt face-up. |
| Open Pair | An exposed pair; a pair of face-up cards. |
| Open Poker | Games where some of the cards are dealt face up. |
| Option | When a player posts a live blind, that player is given the option to raise when their turn comes around, even if no one else has raised; straddle. |
| Out | A card remaining in the deck that could hopefully improve your hand. |
| Outdraw | To beat an opponent by drawing to a better hand. |
| Outrun | Outdraw. |
| Overcall | To call a bet after another player has already called. |
| Overcard | In stud games, a card higher than your opponent's probable pair; in flop games, a card higher than any card on the board. |
| Overpair | In flop games, a wired pair higher than any card on the board. |
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