Top Definition
Michael Fucking Jackson

used to express suprise, anger or happiness.
Person 1: Suprise!
Person 2: MFJ!

Person 1: HAHA i kicked your ass at 1on1.
Person 2: MFJ!

Person 1: I got you a present!
Person 2: MFJ!
by |\|4$TYx|\/|4DD!3 July 23, 2009

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