/ Dictionary / Index B bigmouth: Meaning and Definition of Find definitions for: big•mouth Pronunciation: (big'mouth"), [key] — pl. -mouths -mouth, -mouths a loud, talkative person, esp. one who lacks discretion. any of several fishes having an unusually large mouth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. big mama bigmouth buffalofish Related Content Daily Word Quiz: dentifrice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language