/ Dictionary / Index B bigmouth buffalofish: Meaning and Definition of Find definitions for: big'mouth buf'falofish Pronunciation: [key] a buffalofish, Ictiobus cyprinellus, found in central North America, characterized by a large mouth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bigmouth bigmouthed 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