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1.
My Media Games Network
I MMGNed all day long mate.
by EndBoss-MMGN January 17, 2011
 
2.
(making machine gun noise)

Similar to lol or rofl. Originates from Taylor Moore's laugh. When something is utterly hilarious her tongue rolls against the roof of her mouth, creating a sound similar to machine gun fire.
"Did you hear about the new pirate movie? It's rated arh!"

"Oh, mmgn! That's hilarious!"
by Louise G May 08, 2010