a teacher who is jealous of her own students' talent and gives them sorry grades because she is bitter about still teaching high school.
or-
a teacher who dislikes a student for reasons of her own b/c she is a fat bitch and the student is clearly more attractive than her and keeps the student from going on competitions by illegally taking ONE grade for a nine weeks period.
A fucking bitch who gets on your nerve every day, and decides to take everything you bring in class to the office and makes you want to slap the bitch out of her.