Finish your popcorn early if you’re going to “The Green Inferno,” and save the bucket to barf in.

Horror director Eli Roth (“Hostel”) sends a group of idealistic college students to darkest Peru to protest developers who are threatening to bulldoze their way through a rain forest.

Instead, Roth bulldozes his way through a bloody satire of such stock campus figures as the bearded revolutionary (Ariel Levy) who entices an easily outraged freshperson (Lorenza Izzo) to join his publicity stunt. When their plane crashes in the jungle, the guy who walks into the propeller is among the lucky ones. A tribe of savages — oops, indigenous people who happen to have savage habits — kidnaps the survivors. One fellow gets butchered like a Holstein and finds bits of himself being savored like canapes while he’s still kicking.

In other words: Oh, that Eli. Lacking much of a redeeming purpose, “The Green Inferno” leaves you awed at the scale of Roth’s depraved imagination, if not particularly charmed by his meat-cleaver techniques.