Coined by the HAWP adventure game, available on newgrounds.
Anthony: Fuck you! Have you ever been shot?
Ash: Yes. In the head. In the Persona 3 episode.
Anthony: Oh, right.
Ash: But I did it to myself. Is there a word for that?
Anthony: It's called suicide.
Anthony: IT'S FUCKING CALLED SUICIDE--
Ash: Murderbation! I murderbated.