Phat Possie Share definition Flag Someone who is a complete pussy/degenerate/wimp or isn't down to do shit. synonym for pussy. a: "snap this hundo" b: "nah nig, i already did earlier" a: "bro you're a phat possie" Phat Possie by bigassnig69 November 17, 2016 0 0 Get merch Get the Phat Possie mug. Buy Now — $32.95 See more merch