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1.
A sexual act consisting of four people; Female, male, female, female.
Anyone up for an FMFF later?
by .Clive August 07, 2008
 
2.
a person who is known as Fatty Mc Fat Fat
You ate 10 cheeseburgers and a half gallon of ice cream?! Damn, FMFF!
by anhench November 16, 2007
 
3.
acronym for 'fuck me flip flops'
Hey, look at Elisa rockin' those FMFFs!
by nikks August 27, 2008