someone who hides in the bathroom, kicks down the stall door while you're taking a shit, and proceeds to move you out of the way and steal your feces from under you and run away.
Jim: Oh boy, I hope I don't get a visit from the poo bandit
*door crashes open*
Deanna: Too bad, sucker
*proceeds to steal poo*
Deanna: Poo bandit away!
Jim: But this is a men's bathroom...