a mouth

mouth

1. A tendency to speak brashly or inappropriately. Timmy's got a bit of a mouth on him, so he's always getting into trouble at school.
2. A criminal lawyer. If your mouth isn't there, they'll definitely try to get incriminating information out of you.
Farlex Dictionary of Idioms.

a mouth

1. n. a hangover. I’ve got quite a mouth this morning. I guess I overdid it.
2.  Go to mouth(piece).
See also: mouth
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • mouth
  • diarrhea of the mouth
  • act out
  • paint (something) onto (something)
  • paint onto
  • big mouth
  • bigmouth
  • a big mouth
  • press
  • press (one's) luck