O

Objective Attitude
A rational attitude based on reality.

Odds
The chances of getting various hands or cards.

Odds against
The number of failures per success.

Odds For
The number of attempts per success.

Odds On
Odds at less than even money.

Offensive Bet
A bet designed to build the pot.

Office Hours
A straight from a five to a nine, or from a four to an eight.

Off-suit
Of different suits.

Omaha
Seven-card stud with two hole cards in one's hand and five table cards that are rolled up one at a time.

Omaha8
Shorthand for Omaha high-low split.

On the Come
To bet before one has made a good hand.

On Tilt
Playing very poorly or wildly, usually after losing badly or winning big.

One Eyes
Picture cards with profiles showing only one eye (Jack of Hearts, Jack of Spades, and the King of Diamonds).

One-End or One-Way Straight
A four-card straight open only on one end, such as jack, queen, king, ace.

One-Eye Jacks
The jack of hearts and jack of spades as wild cards.

Open
The first bet of the first round.

Open at Both Ends or Open End
A four-card sequence that can be made a straight by two different value cards.

Open Blind
(1) To open without looking at one's cards. (2) A forced open.

Open Blind and Straddle
A forced opening bet followed by a forced raise.

Open Cards
Face-up cards in stud (Up Cards).

Open Game
A game in which anyone can play.

Open Pair
An exposed pair in stud.

Open Poker
Stud poker.

Open Seat
A chair available for another player.

Open-ended Straight
A straight draw is open-ended if it consists of four consecutive cards without the ace.

Opener
The player who opens the pot.

Openers

A hand with which the betting can be started.

Option
Five-card, high-low stud with a twist.

Option Card
(1) A card that may be either kept or exchanged (Twist). (2) A stud card that may be either kept in the hole orexposed.

Original Hand
The cards dealt to a player before the draw.

Outdraw
To make a better hand than an opponent by drawing better cards.

Outrun
See Outdraw.

Outs
A poor hand that can win on the draw.

Over Button
Players can take over buttons that mean they're willing to play for higher limits.

Overcall
The calling of a big bet after others have called.

Overcard
A card that is higher than any card showing.

Overcards
Cards that rank higher than a pair.

Overhand Shuffle
A shuffle made by sliding cards from the top of the deck into the other hand.

Overhand Stack
An overhand shuffling technique for stacking cards.