(1) the woman in the middle;
(2) one of the men in the middle;
(3) everyone has sex with both the others.
A threesome with 2 men and a woman. The men are most likely bisexual.
Jack: wanna come over to my house and have sex?
Zac: with you? your damn gay!
jack: i mean with my girlfriend too...
Zac: you mean that hot chick that gave you that blowjob?
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!
When the information or circumstances are too extreme to be comprehended.
Eric: Yes, bloody hell that guy was crazy.
David: I know, MMFS!