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Mother Fucking Beast. Someone who is the greatest at something.
P1: Did you see Sam make that touchdown?

P2: Yea, he's a MFB at football!
by LOTR4eva1 December 31, 2011
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Mother Fucking Best-not to be confused with its homograph, meaning: "mother fucking bitch"- Should only be reserved for the people and things in the highest tiers of the world. The titles of all MFBs are mutually exclusive to all others in their profession. Examples: Warren Buffet, Madonna, Google
Wow Tiger Woods is a MFB
by bramcl August 15, 2008
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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
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Mother Fucking Best-not to be confused with its homograph, meaning: "mother fucking worst"- Should only be reserved for the people in the highest tiers of the world. The titles of all MFBs are mutually exclusive to all others in their profession. Examples: Warren Buffet, Madonna, Google
Wow Tiger Woods is a MFB
by bramcl August 15, 2008
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