One who silently sneaks into the bathroom while another person is trying to take a shit. Obviously, this person is disgusting as she doesn't mind the smell of a foul dump as she brushes her teeth and gets ready for bed.
Lindsay was a total pooooop ninja last night. While Brian was dropping some bombs in the bathroom, she snuck in, did her makeup and hair, brushed her teeth, and plucked her eyebrows. Brian didn't even notice her until she was done and walking out the door.