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.