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whacko

[hwak-oh, wak-oh]Slang.
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noun, plural whack·os.
  1. wacko.
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adjective
  1. wacky.
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Origin of whacko

First recorded in 1975–80; whack(y) + -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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