poop-erection Share definition Flag Having hard poop slowly come out of your anus and gradually get bigger until it is too heavy for your anus to hold. Jonny had a huge poop-erection after eating 3 banana's. poop-erection by Ciel June 1, 2006 0 0 Get merch Get the poop-erection mug. Buy Now — $32.95 See more merch