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A threesome involving two men and one woman. There are several options for who actually has sex with whom:
(1) the woman in the middle;
(2) one of the men in the middle;
(3) everyone has sex with both the others.
Thanks to Lara, I managed to get Toby into bed on Saturday; he went for an MMF.
by OrangUtanUK June 18, 2003
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2
Acronym= Male Male Female

A threesome with 2 men and a woman. The men are most likely bisexual.
Theres a hot new MMF video on that website.
by ron October 16, 2004
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MMF is when 2 males and one female have sex in 1 bed at the same time.
Jack: hey Zac,
Zac: ya?
Jack: wanna come over to my house and have sex?
Zac: with you? your damn gay!
Jack: ....
jack: i mean with my girlfriend too...
Zac: you mean that hot chick that gave you that blowjob?
Jack: ya...
zac: k, ill go
Jack: will you give me a handjob too?
Zac: i knew you were gay! you just wanted to hump me!
Zac: FUCK OFF, BITCH!
Zac: YOU JUST WANT TO DO MMF!
by 40yroldvirgin November 07, 2006
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4
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."
by Heura February 18, 2012
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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!
by R233444 June 16, 2009
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6
"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.
by doyoueverjust December 15, 2013
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