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Meaning of whacko

whack•o

Pronunciation: (hwak'ō, wak'ō), [key]
— n., pl. adj. whack•os,
—n.
  1. wacko.
—adj.
  1. wacky.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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