The new genre of horror that surpasses the previous one of simplistic scares. This genre messes with the idea that what you think is natural is the expected and in metahorror, expect the unexpected.
A: "I guess now it would be twitter, that would make more sense"
B: "A bunch of articulate teens sit around and deconstruct horror movies, until Ghostface kills them one by one. Its been done to death. The whole self-aware, post modern metahorror shit. Stick a fork in 1996 already."
A: "I like the stab movies, they're scarier. Its not aliens or zombies or little asian ghost girls. There is something real about a guy with a knife who just... snaps, it could really happen."