OTB: Refers to Off Track Betting that takes place away from the race track.
Octant: Used for any 5 numbers physically adjacent on the Roulette wheel.
Odds: The probability of one event happening over another.
Oddsmaker: The person who creates the betting line that is used by the sportsbooks.
Off: A bet placed on the table yet is not working or even active. Thereby, it is not under any risks.
Off-Number Bet: A wager that determines whether or not a shooter will throw a particular number other than the point prior to throwing the seven in Craps.
Off Numbers: In Craps, refers to the box numbers consisting of 4, 5, 8, 9 and 10.
Off-The-Board: When a sporting event is no longer available to bet on, they take it “off the board”
Off-The-Top: Used for the onset of the deck in all card games.
Off-The-Street: The act of securing a casino job without having an acquaintance in the casino.
Off Track Betting: Refer to OTB.
On: A Craps bet that is working and is being risked.
On Tilt: A player performing quite poorly. Commonly referred to a flustered Poker player.
One-Armed Bandit: Refers to a slot machine, another term for slots, a slang term.
One Down: Used by the stick person in Craps to announce a fallen dice from the table to the floor.
One-Eyed Jack: Refers to the Jack of Hearts and Jack of Spades in Poker as wild cards.
One Number Bet: Refers to a certain number to signify whether or not will be thrown before another number in Craps.