bigmouth: Meaning and Definition of

big•mouth

Pronunciation: (big'mouth"), [key]
— pl. -mouths -mouth, -mouths
  1. a loud, talkative person, esp. one who lacks discretion.
  2. any of several fishes having an unusually large mouth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.