Poo Pencil Share definition Flag When you have so much anal sex, that poo is forced up your dick-hole and comes out as a thin pencil shape next time you pee. I had so much anal sex with Ashley last night I had a poo pencil this morning... Poo Pencil by uerhueuwbwu August 23, 2011 0 0 Get merch Get the Poo Pencil mug. Buy Now — $32.95 See more merch