8
Person 1: I killed your mom.
Person 2: Your such a MFB!
by Pumpernickle-Bandits February 11, 2011
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9
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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10
1. Michigan's First Bank.

2. Motherfuckin Bitch
1. I went to MFB to rob some money.

2. She is an MFB.
by Qui Long July 09, 2009
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