An incredibly fat girl is being constantly bullied for her obesity at school by 2 school girl bullies. She is lucky enough to have at least one friend, an African American girl i think.
One scene has her begging the bullies not to drop her drawings in the toilet drain, which the latter does anyway, while being cruelly nicknamed “Piggy”.
Her friend constantly tells her to stand up for herself. At one point, in class, the fat girl finally does a little payback by cutting one of the bullies’ hair, only to end up getting chased by her later on.