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1.
1. A comedy having gloomy or disturbing elements, especially one in which a character suffers an irreparable loss.

2. A comedy characterized by morbid or grimly satiric humor.

see Gallows Humor

A good example of dark comedy is the series "Dead Like Me", a show with grim reapers and afterlife themes.
Fact: "Burn After Reading" is a hilarious dark comedy film!
de Osbourne Cox 12 octobre 2011
 
2.
a movie that is not funny.
Burn After Reading is a dark comedy.
de Brewhaus 12 novembre 2009