A student that makes fun of others and says crazy shit, like threats about shooting up schools. This person is so unpredictable that every time you hear a loud noise you duck to see if she was bluffing or not.
A School Sh-Bully is Teacher -"Seems like (Person's Name) didn't come to school today"
Students-"Oh Shit"
*Loud Noise in hallway*
Student #1-"EVERYONE GET DOWN (Person's Name) WASN'T BLUFFING"
*Turns out some one just dropped there binder*