FFT! Share definition Flag A shorter way of saying Fail For Them, usually used to poke fun at someone. Person 1: Did you hear the Jonas brothers fell down a manhole? Person 2: Haha! FFT! FFT! by The Worderer... :D June 29, 2009 0 0 Get merch Get the FFT! mug. Buy Now — $32.95 See more merch