A certain type of grading curve, usually above 30%, which is instituted by a teacher in his or her course when he or she has knowledge of the almost impossibility of succeeding at said course with an uncurved grading system. A Kro curve is usually inordinate and, unlike other grading curves, carries no punitive connotations and is regularly instituted in said course. Usually, a Kro curve is accompanied by mass cheating and/or no regulation of when class assignments are done or turned in. However, even with this kind of curve, said class is usually still extremely challenging.
Its origin is not known.
"I would've failed, but with the Kro curve I got a 108%."