Looking for a movie that has this girl that one group of boys are obsessed with. One scene they are at a camp fire and they get her to drink or eat something and as it starts to get her loose and removing clothes a guy comes walking in with a hockey mask on and scares everyone away.

It sounds like it could be one of the Friday the 13th movies. There are many sequals so I can't say which one it may be. I believe most of the movies take place at Camp Crystal Lake and the villain, Jason Voorhees, wears a hockey mask and goes around killing teenagers. Hope this helps.

No that is not it, after everyone runs off in fear the person in the hockey mask lifts his mask and ask if anyone has seen his ball