MNO
- Maiden – A horse that has never won a race.
- Make – To shuffle the deck of cards.
- Marker – An advance extended to a player on credit.
- Marker Puck – Plastic disks that the dealers use to mark the point on the craps table.
- Mechanic – A dealer who can peek at the top card and deal the next card if the top card is not to his advantage.
- Michigan Bankroll – A large bankroll consisting mostly of dollar bills with a large denomination bill on the outside.
- Middles – Winning both sides of a betting proposition.
- Midnight – Betting that the number 12 will appear on the next roll.
- Mini Baccarat – A scaled down version of baccarat, played with fewer players, dealers, and formality but following the same rules as baccarat.
- Monkey – Colloquial term for a card with the face value of ten.
- Monster Roll – A hot roll lasting more than 20 minutes or that generates a lot of winnings for the players.
- Mop – The stick used by the stickperson to move the dice.
- Morning Line – A linemaker’s morning guess as to the probable odds on horses that are to run in afternoon races.
- Muck – In Poker, To discard or throw away your hand.
- Mudder – A horse known to favor a muddy track.
- Nailed – Caught in the act of cheating or stealing.
- Namble – Online Gambling.
- Natural – Definition 1: In Blackjack, it refers to an Ace and 10 count card. Definition 2: In Craps, it refers to a 7 or 11 on the first roll.
- Net Winnings – Total payout minus the player’s stake.
- Nickel – A $500 wager.
- Non Negotiable – A promotional chip that can’t be exchanged for cash.
- Non Value Chip – A gaming chip which the dollar value is determined by the amount of the buy in and the amount of chips taken.
- Nose Open – To lose control, usually when losing and attempt to steam one’s way out of the trap.
- Number Pool – The range of numbers from which the player chooses the numbers to play. A typical lottery pool ranges from 1 to 60, and the keno pool is 1 to 80.
- Number Two Man – A dealer who can peek at the top card and deal the next card if the top card is not to his advantage.
- Nut – Definition 1: The overhead costs of running a casino. Definition 2: The fixed amount that a gambler decides to win in a day.
- Odds – The ratio of probabilities or the amount a bet pays. For example 2-1, 3-2.
- Odds Maker – A person who establishes the original and subsequent betting lines.
- Odds on Favorite – A horse or competitor that is so favored that the odds are quoted as less than even money.
- Off – Bets that are not working.
- Off The Board – Sporting events, casinos or bookmakers will not accept action on.
- Office – A secret signal passed from a gambler to his confederate.
- One Eyed – The Jack of hearts, Jack of spades or King of diamonds. So named because the characters are drawn in profile, thus showing only one eye.
- One Roll Bets – Wagers that win or lose depending on the next roll of the dice.
- On The Hop – A one roll wager.
- Open – In poker, the player who bets first.
- Outside Bets – Roulette bets located on the outside part of the layout. They involve betting 12 to 18 numbers at one time and result in a lower payout.
- Outside Numbers – In Craps, 4, 10, 5, and 9
- Overlay – A good bet where you have an edge over the casino.
- Ozzie and Harriet – A hard 8.