What is the name of the 90s movie that...

I'm not sure if it's some kind of comedy, I watched that movie when I was a kid, but there are some guys involved in some kind of biker cult that used pants and horns like goats, apparently it's a music festival where they offer drugs literally like candy 🍬 and there are two infiltrated individuals. Within the music festival there will be a kind of sacrifice that is a virgin woman, but they manage to prevent it and a guy gives drugs to a giant snake and it dies.