wacko

wacko

[wak-oh] Slang.
noun, plural wackos.
1.
Also, wack. an eccentric, strange, or odd person.
adjective

Origin:
1970–75, Americanism; see wacky, -o

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World English Dictionary
wacko (ˈwækəʊ)
 
adj
1.  mad or eccentric
 
n , wackos
2.  a mad or eccentric person
 
[C20: back formation from wacky]

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