Top Definition
A Word created at 4:39AM August 19,2005 when a person in a fierce but stupid conversation it caught on and people in the sex chatrom on used it.
F.U.S.A.B Means "Fuck You, Stupid ass bitch" It is used weirdly. Some say a person with the screenname "JayTheGreatest" originally used it.
Fusab Joo

You stupid ass fusab bitch

Or just the plain
by James Reagan August 19, 2005

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