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Meaning of whizzo

whiz•zo

Pronunciation: (hwiz'ō, wiz'ō), [key]
— Brit. Slang. Brit. Slang.
—adj.
  1. absolutely first-rate; superb; excellent.
—interj.
  1. (used as an exclamation of approval, wonder, or pleasure.)
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.