Top Definition
Motherfucking Cocksucking Bitch or Motherfucking Cocksucking Bastard.

Flat out one of the best ways to make fun of someone. It means exactly what it stands for.
Developed by myself.
Dude1: Yo, dude, it looks like u put some weight on!

Dude2: Bull shit, you MFCSB!
by _OMEGA_ July 22, 2006
5 Words related to mfcsb

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