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It's an abbreviation for "Mother Fucker".
Guy - I fucked your mom.
Dude - You sick Mo-Fo!
mo fo by kane April 27, 2003
an abbreviation of "Mother Fucker". it is used for slang.
YOU MO FO!!!!

(you mother fucker)
Mo Fo by Shana April 13, 2005
slang for " Mother Fucker '
mo fo by Preston November 7, 2002
Short for mother fucker
Mo-Fo by Sam July 24, 2003
short for mother Fucker- (a place)
someone is gonna get hurt up in this mo fo
mo fo by Gdubs October 3, 2006
If you are a mo fo you are a mother fucker!!!!!
"You mo fo" says the boy "fuck you" you reply
mo fo by dan543 April 28, 2006