wacko

[wak-oh]Slang.
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adjective
  1. wacky.

Origin of wacko

1970–75, Americanism; see wacky, -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018


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British Dictionary definitions for wacko

wacko

adjective
  1. mad or eccentric
noun plural wackos
  1. a mad or eccentric person

Word Origin for wacko

C20: back formation from wacky
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for wacko
n.

extended form of wack, recorded from 1977.

Online Etymology Dictionary, © 2010 Douglas Harper