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wacko

[wak-oh] /ˈwæk oʊ/
noun, plural wackos.
1.
Also, wack. an eccentric, strange, or odd person.
adjective
2.
Origin
1970-1975
1970-75, Americanism; see wacky, -o
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wackos

wacko

/ˈwækəʊ/
adjective
1.
mad or eccentric
noun (pl) wackos
2.
a mad or eccentric person
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
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Word Origin and History for wackos

wacko

n.

extended form of wack, recorded from 1977.

Online Etymology Dictionary, © 2010 Douglas Harper
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