FMF

Fuck me forever

When you know it's over with someone, and though the regret you feel tears you apart, this lets them know how you want them to feel about you. Not because you feel the same about them, but there's nothing more you can do.

I can see this is going nowhere. You still have no idea how I feel, but it doesn't matter now. You'd best forget about me... FMF.

FMF

a female furry who is Buff as Shit

I love to jerk off to FMF

FMF

FMF - Funky Monke Friday
The day where you go all out and go crazyyy aahhh go stupid

Person 1: “Oh, Its Friday today.”
Person 2: “Oh cool, Its FMF.”

FMF

FMF can also refer to "fill me full". As in group sex or orgy. When I mentioned it to a female friend she said to her it ment fuck me forever.

I learned this off Craigslist. A female had FMF DP. As in fill me full double penetration.

FMF Paradox

Fucking my family paradox, The theory you can never get too close to someone who is having sex with a member of your family because of the expected akwardness. Also can be used as fucking my sister paradox or fucking my mother paradox.

Friend 1: My Sister's boyfriend keeps trying to be my best friend.

Friend 2: So what's wrong with that?

Friend 1: FMF paradox man, it's too awkward.