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A threesome that is male male female.
See also: MMM , FFM , and FFF
One(F): Yo Two, you down to MMF with Three?
Two(M): Only if Three is down for it.
Three(M): I'm in!
*then came the straight woman-who-is-with-Two-but-is-attracted-to-Three's dream threesome
MultiMedia Fusion - a very powerful game and application creation tool. This is a very common word between "clickers", together with TGF and KnP.
Main Mother Fucker
This could be used to describe a boss, or other leader-like figure in a workplace or otherwise.
"that guy's the MMF around here, you dont wanna screw with him"
mental mind fuck
When the information or circumstances are too extreme to be comprehended.
"He says he loves me, but he still wants to be with his wife. It's a real mmf."
Makes Me Fucking Sick!
David: Did you see that stupid episode last night.
Eric: Yes, bloody hell that guy was crazy.
David: I know, MMFS!
"mentality my friend". Mmf is used to describe people who don't know how to dress or purchase and wear an item of clothing that is just completely horrifying.
*Sees girl passing by with pink sparkly uggs* Girl 1: Did you see that? Girl 2: Mmf.. Girl 1: I know omfg.