MFF 

A threesome that involves a male and two females. Usually, the guy is inn the middle. One woman is banging the guy, while the other has her muff in the guy's face, getting it licked.

The pornographic text was labelled MFF.

MFF by Giannico August 16, 2003

MFF 

An acronym of the furry convention "Midwest Fur Fest". It's the world's largest furry convention taking place in Rosemont, Illinois each December.

Hey, are you going to MFF this year?

Nah, I can't be assed. The wait for registration over there is so long it may as well be called line con.

MFF by Pyyre April 14, 2019

MFF 

Mother Fucking Friday
Other forms: MFM - Mother Fucking Monday, MFT - Mother Fucking Thursday

Used to emphesize that it's a good friday, or something great is going to be happening.

WOOT! It's MFF!!! I'm getting a 1/2 pound of weed tonight!!!

MFF by filllx November 25, 2007

MFF 

Acronym for Man Foot Fetish. Self-explanatory.

Matt has a severe case of MFF.

MFF by High School Musical June 27, 2006

MFF 

MFF + Manditory Fat Freind.... You ever notice that in group of hot girls there is ne that if Fat... The reason is so the rest of the girls look better and it makes them stand out...

"Look at all the hot girls in that group." "Yeah but they have a MFF"

MFF by Will May 13, 2005

MFF 

Stands for Mr. or Mrs. Fartty Farterson

Yo dawg my homegirl farted on me, damn MFF.

MFF by George Hoefer April 29, 2005

MFF 

Motherfucking Fuckboy. A boy who plays every girl you know. A boy who hooks up with your friends.

"Hey did you hear that Brett played Lisa? What a MFF!"

MFF by Hdixiebabe August 9, 2016