[monged (out)] {adj.} Severely drunk/high.

[moniker or monicker] {n.} Name, nickname, signature or mark.

[monkey] See: [GREASE MONKEY], [MAKE A FOOL OF] or [MAKE A […]

[monkey] {n.} £500.

[monkey around] See: [FUCK AROUND], [HORSE AROUND], [MESS AROUND].

[monkey business] {n.}, {slang}, {informal} 1. Any unethical, illegitimate, or objectionable […]

[monkey on one's back] {n. phr.}, {informal} An unsolved or nagging […]

[monkey wrench] See: [THROW A MONKEY WRENCH].

[monster] See: [GREEN-EYED MONSTER].

[month in, month out] See: [DAY IN AND DAY OUT].