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2 definitions by Billy Casper

 
1.
(noun 1)
a mentally unstable person who acts irrationally or foolishly; an eccentric person

(noun1)
"They put him in a mental institution because he was a headcase."
by Billy Casper March 21, 2008
60 24
 
2.
(noun2)
a colloquial term used to describe a mentally sound person who likes to act foolishly for fun.
(noun2)
"He was being a headcase again."
by Billy Casper March 21, 2008
43 19