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Abbreviation for Males Masturbating Online. MMO is an organization of homosexual males that meet online to masturbate together.
Homo 1: "Dude don't forget about the MMO meeting on Skype today."
Homo 2: "Don't worry I won't forget."
Homo 1: "It'll be the gayest meeting yet."
Homo 2: "Don't worry I won't forget."
Homo 1: "It'll be the gayest meeting yet."
by Philsteve June 22, 2014
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