A male that frequently spoils books, movies, tv shows, and news without concern or regard for others. They will often do so in person or through social media.
That spoiler king ruined the last Star Wars movie for me!
Your spoiler king best friend told me you were planning on proposing to me.
I’m going to unfriend you on Facebook because you are a spoiler king.
Someone (usually a celebrity), who drops spoilers and hints to their fanbase without people realising they were being spoiled. Only in hindsight, it becomes clear that placement of objects, melodies hummed etc. were spoilers. A true spoiler king.
So the guitar on his bed in his livestreams was a spoiler for his new show? What a spoiler king!