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1.
Films that are made with the intent to frighten.

Classics of the horror movie genre were filmed thru the 1950's to the mid 1980's. The teen genre, though no stranger to horror movies, is believed to have caused the demise of "true" horror movies in the 1990's. Typical teen movies now often mix with the horror genre, causing genuine horror movies to often be thought of as a thing of the past.
"Horror movies are among some of my favorite movies"
by Jessica T July 25, 2005
 
2.
A stupid movie containing vast amounts of violence that is never actually scary. However, it is referred to as a "horror" movie because of the horrors that are experienced when one returns to their home subsequent to the viewing of the movie.

Examples include the following; various nightmares related to the movie, the unwelcoming of that dark room at the end of the hall, the impression that there is a character from the movie in one's closet/bathroom/shower or other enclosed spaces in or near the bedroom, and other similar experiences.
"Hey Jim, you wanna come over to see a horror movie tonight?"

"Fuck no, not after the last time when I almost shit myself when I got home."
by hardrock711 October 24, 2011
 
3.
Having sex with a girl who is menstruating - (making a) horror movie
Menstruating lady to lucky man: Hey do you wanna go and make a horror movie?

"Aw man, I romanced with this girl last night and it looked like a scene from a horror movie because she had her period"

Girl: No, not tonight I'm bleeding from my vajay-jay
Boy: That's cool we can play horror movies

"unless you like horror movies you don't want to go down there tonight"
by M.C27 September 08, 2012