/ Dictionary / Index B biff: Meaning and Definition of Find definitions for: biff Pronunciation: (bif), [key] — Slang. Slang. —n. a blow; punch. —v.t. to hit; punch. biff Pronunciation: (bif), [key] — n. biffy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: biff (Thesaurus) bifarious biffin Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language