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A large, hairy, usually angry seeming individual. Most often spotted during extreme music events, or during some form of violent sporting events. It is usually used with equal measures of awe, fear and respect.

Alternitavely it can be used to describe yourself when wishing to seem more imposing.
"woah man...look at that crazy viking motherfucker!!"

"who should I kick off too?"
"anyone but that crazy viking motherfucker...that dudes huge!"

"i'm a crazy viking motherfucker, and i will get medieval on your ass if you don't get the fuck away from me RIGHT NOW!"
by TheSanityAssassin November 03, 2004