FAOP Share definition Flag FAOP is an acronym meaning Freakishly Autistic Obnoxious Party. May lead to dancing movements consisting of convulsions and spontaneous inch-worm-like impressions. "Dude let's throw a banging FAOP tonight! You down?"Response: "A FAOP?! FUCK YEAH!" FAOP by Elaige August 2, 2009 0 0 Get merch Get the FAOP mug. Buy Now — $32.95 See more merch