Poosidue Share definition Flag The real or imagined residue of feces that remains on a penis once it has entered someone's anus. "I don't want to go down on my bisexual friend Gary. I bet there's poosidue all over his dick!" Poosidue by Alison of a Gun November 8, 2006 0 0 Get merch Get the Poosidue mug. Buy Now — $32.95 See more merch