spoiler slut 

Someone who spoils the book or movie for you. They will find out the endings of things just to spoil them and to piss you off.

OMG! Marilyn is a spoiler slut.

spoiler slut by mcnuggetdestroyer January 3, 2018

spoiler slut 

A person who can't wait until an episode of a show airs to find out everything they can about it, and goes looking or asking for "spoilers" about the episode.

"Oh, man, did you see the preview of the 'Smallville' finale?"
"Yeah, I heard Chloe dies in that episode."
"What?!!! No way! Tell me more."
"You're such a spoiler slut."

spoiler slut by Laura Tobin June 4, 2004