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.
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1. Michigan's First Bank.
2. Motherfuckin Bitch
1. I went to MFB to rob some money.
2. She is an MFB.
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MFBS = Mother Fuckin' Bull Shit.
Everyone said that chick was DTF but she wouldn't even come home with me. That's some MFBS.
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MFBS is the acronym for "more fucking bullshit" a very common situation.
All that time I spent researching that product for Amy was just MFBS!