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wacko

[wak-oh]Slang.
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noun, plural wack·os.
  1. Also wack. an eccentric, strange, or odd person.
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adjective
  1. wacky.
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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
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noun plural wackos
  1. a mad or eccentric person
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Word Origin

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.

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Online Etymology Dictionary, © 2010 Douglas Harper