poo boner Share definition Flag When you need to poop and you get an erection from poo rubbing up against your sphincter. Man, Joe, I've got a poo boner and I need to use the restroom. poo boner by PinkPussyTom October 29, 2022 0 0 Get merch Get the poo boner mug. Buy Now — $32.95 See more merch