Someone who quietly shits in a urinal in a public restroom (usually school restrooms), and leaves it there and sneaks out, only for the next person to discover.
Person 1: Yo! The urinal shitter strikes again!
Person 2: I know right, urinal shits are so gross.
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The Urinal shitter is guy that ocasionally shits in urinals. Most of his shitting happens in the school urinals. He is often a 4.0 GPA student and because of that he isn't suspected to be the one who shits until the school janitor caughts him.
John: Hey, I think Mark is the urinal shitter.
Robert: Nah, he is a 4.0 GPA nerd, it couldn't be him.
Janitor: It is Mark, I saw him yesteday!
Mark: Oh shit im cooked