Webster's Collaborative New Word Dictionary - M
macaron (n.): a confection consisting of two small, round (usually colourful) biscuits with a meringue-like consistency, made with egg white and sugar.
mama put (n.): a street vendor, typically a woman, selling cooked food at low prices from a handcart or stall. Also: a street stall or roadside restaurant run by such person.
mentionitis (n.): originally: a tendency to mention something for the sake of comprehensiveness or exhaustiveness, rather than relevance (now rare). In later use... (see Oxford Dictionary).
Mouthie (n.): a person's mouth.