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8.
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
 
9.
MFB
Mutha Fucking Bitch!!!Usually horny peeps call this to slutty bitching girls
BOY: OMG u mfb!
can i lick ur boobs and eat u out???

SLUT(GIRL):SURE!!!
by sexiibitchinghor April 24, 2007
 
10.
MFB
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