Shortened form: Bill Nye
The grade attributed to college work that is especially poor, incomprehensible, or which otherwise provokes a negative response from the grader, i.e. "Jesus Horatio Christ on a jet-ski, this paper is fucking awful."
Symbolized by a frowny face drawn in feces (preferriby non-human, but results may vary according to circumstances) on the physical copy of the student's paper.
Etymology: a variation of the pornographic and scatological practice known as the Dirty Sanchez.