/ Dictionary / Index W whizzo: Meaning and Definition of Find definitions for: whiz•zo Pronunciation: (hwiz'ō, wiz'ō), [key] — Brit. Slang. Brit. Slang. —adj. absolutely first-rate; superb; excellent. —interj. (used as an exclamation of approval, wonder, or pleasure.) Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. whizzer who Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language