Being sexually attracted to anything that's dead. The opposite of
biosexual.
Person 1: Hey, my mom died recently.
Person 2: OOhH- where is she?
Person 1: In a better place...
Person 2: No, where is her body?
Person 1: What?
Person 2: MY NECROSEXUALITY IS KICKING IN. I NEED YOUR MOTHER'S BODY FOR SEXUAL PURPOSES.