whacko

whack·o

[hwak-oh, wak-oh] noun, plural whack·os, adjective Slang.
noun
adjective

Origin:
1975–80; whack(y) + -o

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
whacko

noun
a person who is regarded as eccentric or mad [syn: nutter
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Whacko is always a great word to know.
So is lollapalooza. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
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