need help with name of movie

I am trying to think of the name of a horror movie. I saw at least 10 years ago so it is not new. In the movie, the only thing i can recall is that a girl(possibly a cheerleader) throws up in a toilet and in her vomit is a snake or some creature. they show it going down the drain, and than later on i believe she runs into the monster. Help!
thanks BigL

[jay o2 waster]

Class of Nuke 'Em High

[jay o2 waster]

http://imdb.com/title/tt0090849/

thanks

[jay o2 waster]

your welcome