Spider Lives in the Bathroom, Poops on the Sink

This spider moved into my bathroom recently.

It has apparently been eating very well; its abdomen is the size of an M&M peanut.

Also, note that one of its teeth (chelicerae) seems rotted.

Eventually, it reacted to the camera by turning around, pooping on my bathroom sink, and going back into its nest. If I hadn’t watched it happen, I would never believe what this was. It was about the same diameter as a pencil.