When the toilet is clogged and you plunge it down using your foot.
The origin of Shitfoot is when Aria Nafeces brought his shit stained shoe into class and smeared satanic rituals/ naruto jutsus
all over the floor. He was soon taken out of the class to wash his shoe in the bathroom, which took copious amounts of times, and the poor chair was taken to
maintenance.
Since the fateful shitfoot day of
September 4th 2018, it is said that if you plunge your shit clogged toilet three times and say "Shitfoot No Jutsu", you will summon Shitfoot himself to your bathroom. He will then smear shit all over you.