A trailer rape occurs when one watches a really awesome trailer for a movie and thinks "Oh I've got to see this sh*t". Only to watch the movie and realize that the movie completely sucks. The best parts were condensed into a 3 minute trailer.
Rick: Hey dude, we saw the trailer for skyline and decided to see it, but that movie sucked major balls.....
Brock: Yeah man, you got fucking trailer raped!!