Top Definition
A measurement of fun.
Today's episode of happy days was great it was 50 fun units.
#fun #unit #fun unit #measurement #popcorn
by Dick Assman September 28, 2009
Noun. A small unit in a group of friends who brings life to the scene, and make's it happening.
The fun-unit always bring the house down!
#homies #crew #posse #antonym: math team #well only in certain cases
by KGC January 02, 2007
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