1 definition by ACjoe

Top Definition
MFB
MY FUCKING BALLSAC.
An Acronym formed at the shores of Atlantic City by a group of bored teenagers meaning bullshit.
Steve:Man I banged both of those broads last night.
Joe:MFB, son. the only two things you banged were your left and right hands.
by ACjoe July 31, 2008

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