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1.
Stands for "I Got Mine Mother Fucker". Appropriate term for people who achieved their goal and are too selfish to help others to achieve theirs.
John: "Hey Mike, a group of us are going to meet to tackle this calculus homework, will you join us?"

Mike: "No way dude, I'm already finished and have some movies to watch. The homework is pretty hard but I'm sure you can figure it out."

John: "You're such an IGMMF."
by tempomeister2 October 09, 2011