Slenderman poops alright, but they are invisible poops. He poops a lot but he is embarrassed to admit it. His poops are also soundless, but you can sure smell them. He has the nastiest poop in the world. I know this because I read it in the Slenderman Poop book and I followed him before and I smelt his poop like the book told me I would. Hope this helps you out.