ExploderWizard
Hero
How? Show the rule. I mean, clearly you can hide an object, but the game doesn't provide any way to do so. A DM has to come up with his own rules for it.
What the world become? I suppose no one in the game world wipes their behind after doing their business either because, after all, there are no rules for it.

Heck, there are no rules for waste elimination at all so I suppose no creature in the game world can do it. Extrapolating from that, since there ARE rules for required nourishment but no rules for pooping we can assume that every creature in the multiverse just blows up! No more game world, thank you for playing.