If god is omnipotent then he must be able to poop, otherwise there would be something he cannot do and he would not be omnipotent.

On the other hand, pooping requires a digestive system and an bum to poop through. If god has these things then he must have a specific location in space where he keeps his bum, and hence the rest of his body, and thus would not be omnipresent.

Thus we see an impossible set of propositions. It cannot be the case that all of the following are true:

P1: god is omnipotent

P2: god is omnipresent

P3: god poops