Libu

A word used in the early 2000s in eastern Vantaa, Finland. Used to define a person or a thing that is over-the-top crazy, or mad as hell. Can be formed to be used as a verb as well.

That guy beat five opponents at once and smiled when he was hit in the face. He's a 'libu' dude!
As a verb: The principal was 'libuing' to us after we took a bag of dog turd and put it into his briefcase.