Definitions by K Biscuit

Kook 

A person that you would also refer to as a loser. Generally directed at mates when they say or do something ridiculously idiotic. Can also say someone is 'kookin it' if they are doing something dumb, like re-dating their bimbo ex-girlfriend.

Dave's such a kook.
Old mate is kookin it so hard.

Kook by K Biscuit December 4, 2010