It's when you take a massive
dump over your
towel. You wait for it to become dry and
crusty so you can wipe it off the towel so you can sculpt it into a anime body pillow.
Mom: Niggato what are you doing in there?
Niggato: I'm masterbating to my
towel feces! Don't look!
Mom: What?!
Niggato: you'll never catch me
Narrator: Niggato runs away from his room, fleeing with his feces body
pillow