/ Dictionary / Index W whammo: Meaning and Definition of Find definitions for: wham•mo Pronunciation: (hwam'ō, wam'ō), [key] — Informal. Informal. —interj. (used to indicate the sound of a blow, collision, falling object, etc.). —n. immense energy; vigor: a movie with plenty of whammo to please the kids. —adj. characterized by such a strong effect: a show with a whammo ending. —adv. wham. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. wham whammy Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language