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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
mo fo by Preston November 7, 2002
Mo-Fo by Sam July 24, 2003
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