A film which focuses on morbid elements a lot, the type of morbid elements that fascinate or excite people. For example, a crime movie which focuses more on the details of committing the crime or its effects on the victim, rather than the efforts to solve it. Or a movie that's excessively violent for no real reason. In fact, that - excessive violence or sexuality - seems to be the main definition of an exploitation film. Because one person's "gritty realistic drama" is another's form of entertainment in the "grit" itself, the line can sometimes be pretty thin.