The act of someone intentionally shitting on the floor, the toilet, or the wall of a bathroom stall. In some cases leaving a variety of pubes, poop, or a urine trail behind so when someone enters the bathroom they know something is wrong. These phantom shitters usually leave a signature to cover their true identity.
I walked into walmarts bathroom yesterday and knew something was a miss when I saw toilet paper leading to the bathroom stall. When I opened the door it was St. Diarrheas day Massacre all over again.