A person who has sex with dead people.
My buddy Greg is a necrophilliac
A person with a mental disposition giving them the pathology of power to such a degree, they feel the need to have sexual intercourse with a corpse to fufil sexual gratification. This is usually assosiated with people so god damn fucking ugly no one would touch them and Murderdolls fans.
A homosexual man, who likes to rape dead dogs of the same gender! mmmm!
'oh dude, i just found out my mums a total homocanine necrophilliac! SWEEET!'