When liquid feces becomes pasted along the rim of a toilet. Similar physics of the brown matter are seen with Tony's wicket skateboarding moves back in the late 1990's. Not to be confused with the "upper-decker" (crapping in the tank) or the "ground-rule double" (crapping on the seat and letting the poop fall in).
College student: I ate some Taco Bell, some magic mushrooms, and a bunch of other garbage then pulled a Tony Hawk on the shitter. In retrospect, it was real bad case of the green apple slatters.