superwaffle350's avatar
The way I see it, Zombies don't have much by way of bodily functions. Sure they eat, but I don't think they pee or poop. Or even throw up. I think they just keep eating until their gut bursts, like so: [link] But, being Zombies, they don't die when that happens. So they just keep on eating and having food fall right through them, leaving a trail of yuck wherever they go.