popcorn movie
A film that is entertaining to watch but is generally not of a very high quality or rich in emotional or intellectual depth. A: "So what movie do you want to go see later?" B: "I don't feel like watching anything too heavy or complex—let's just see whatever popcorn movie is out."
tentpole movie
A film with a very large budget and production value that is meant to provide substantial revenue to the production company. Big blockbusters used to be quite the rare cinematic event, but we've gotten to the point now where there's a tentpole movie coming out nearly every weekend of the year.
snuff movie
A film that shows the actual murder or death of a person. Although snuff films are illegal, they are still widely circulated on the black market.