A person who commits heinous acts of the fecal nature.
Including: Upper-deckers, unflushable logs, poop nuggets in the shower, ect...
After waking up and seeing the large shit on the floor, Mark ran through the house searching for the poopetrator.
When your cat takes a fresh deuce after you've just cleaned the litter box.
Damnit!!! I just cleaned the litterbox and this Poopetrator shat once again!!!!!