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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
A sexual act consisting of four people; Female, male, female, female.
Anyone up for an FMFF later?
by .Clive August 07, 2008
acronym for 'fuck me flip flops'
Hey, look at Elisa rockin' those FMFFs!
by nikks August 27, 2008