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1.
Pornography involving the mutilation or death of an individual. Often considered to be a disgusting variation of classical porn.
Stabbing a woman while raping her, now THAT's murder porn.
by Rooney Pwner December 02, 2005
 
2.
a media work, written or recorded, that depicts sex and gore in such nasueating levels that only a necrophiliac would enjoy it. hence, murderporn.
I saw sin city last night, it was murder porn.
by mouse May 08, 2005