A fork of Rural Dictionary
It's the Forget Finger February or the Free Finger February.
Its a "challenge" where people with vagina can't masturbate during February.
It's the same as the NNN
I've had the NNN now my girlfriend is doing the FFF
*sally’s best friend of years does something fake to her*
sally : you know what! fff!
I don't give a FFF whether you like my beard.
I must add that I had to wallow through 8 pages of alternate usages to learn that an expression that was common in the 70's didn't appear in your database. Moreover, the expression has nothing to do with obesity.
FFF, or forced family fun, is one when forced to do a "fun" activity by your family that you don't want to do. Families can also use FFF to attempt to paint the idea that the family is functioning. (In that case, it would be similar to faking it for the holidays.)
Person 1: "Wanna get coffee tomorrow?"
Person 2: "I can't, I have FFF."
Person 1: "Bless your stars."