Top Definition
Fimbul(Norse for 'Mighty')+Bum(English for any person in a shitty financial state, often a fucktard or assclown).

Therefore, a mighty bum. A king of the fuckers.
That shitehole on the street was one hell of a fimbulbum.

Lord allmighty, Paul! You are one fimbulbum!
by Dane November 16, 2003

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