01: A mentally unstable person who acts carelessly; 5150.
02: A person who is not of sound mind.
03: A crazy, nutty, eccentric person.
That BTK dude is a real head case.
by Mr. Terrence L. Trezvant March 03, 2005
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A game where you and a bunch of guys sneak up on someone at a party, jam a beer 12-pack or case over their head, and swat them while they cant see. Works great on rugby rookies or some chump.
Hey guys, that punk over there looks like a good case for case head!
by yankee01 May 20, 2010
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