I saw it a couple of years back because it was free on youtube or streaming on netflix or something. It was hugely disturbing, but not in the way I’d expected.
Basically, this guy invites the bookish loner girl to a party. Then he and his friends rape her, including with foreign objects. It’s brutal. She is found unconscious by the rapist’s girlfriend, who somehow believes it was consensual and ties her to a tree, where everyone laughs and throws things. Good lord, this movie was traumatic.
She gets a reputation as a slut and everyone at school whispers about her. Eventually, not NEARLY soon enough, she gets revenge by killing them all in poetically just ways.
I’ve described it as “if Easy A was horrifying and not funny at all.”
It’s driving me crazy that I can’t find it.
Bad Reputation (2005)
http://www.imdb.com/title/tt0478976/?ref_=fn_al_tt_1