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whacko

[hwak-oh, wak-oh] /ˈʰwæk oʊ, ˈwæk oʊ/
noun, plural whackos.
1.
adjective
2.
Origin
1975-1980
1975-80; whack(y) + -o
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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