head case

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.

head case

Someone who hogs the ball in basketball.

Yo man you are a true head case.

Case Head

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!