Death porn is a slang term for the material found on the internet that is intended to gross out its viewers. All pictures/videos of dead bodies, horrible accidents, or blood and guts can all be classified as death porn. This includes almost all of the content of rotten.com, and the faces of death series of videos.
A death porn addict is somebody who looks through rotten.com or searches for 'faces of death' on Limewire.
When I grow up, I want to be a death porn star.