The act of or urge to fully mudrer one's sister (older or younger) as she has a certain skill and manages to nag, belittle, and generally attempt to control your life as she does not understand that she is not in fact your mother.
Dude, i'm totally going to commit sororicide if my sister doesn't get off my tits pretty soon.
Suicide as a result of excessive homework, bad grade(s), your teacher being a dick, etc. In other words, when you kill yourself because school just really fucking sucks and you can't take it anymore.