Mass Friending Frenzy - Mass friending of people you don't know on Facebook just because they went to school with someone you know, or worked at the same company - or have some really remote, obsolete connection to you. Taking six degrees of separation to a whole other level!
#mff Friend Request: John Wenevermetbefore "'I went to the same elementary school in the same decade you did!' ; Susie Cuddles: 'Hey, I like kitties too! Friend me!' ; George Sputnik 'I worked at McDonalds! Wanna be friends?'
by Coug90 January 7, 2014
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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.
by Giannico August 16, 2003
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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.
by Pyyre April 14, 2019
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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!!!
by filllx November 4, 2007
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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"
by Will March 14, 2005
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Stands for Mr. or Mrs. Fartty Farterson
Yo dawg my homegirl farted on me, damn MFF.
by George Hoefer April 29, 2005
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