Top Definition
Exclamation of outrage. Stands for "Jesus fucked Mary Magdalene's Cunt!"
guy 1: Hey did you delete Grey's Anatomy?

guy 2: Yeah that show sucks.

guy 1: Jfmmc! I was going to watch that you goddam cum dumpster!

guy 2: You're a fag.
by walter_ego November 27, 2010

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