Jeff the Killer was a 'creepy pasta' originally created in an online story. He story is told to shock and scare people, telling the story that Jeff was in fact a normal boy who went insane. He murdered his family and went so far as to cutting his eyelids off so he could always see and cutting his mouth so that he could 'always be smiling.' He is featured in the game in which Pewdie plays.
About the Game
I don't really know what to write here... Has anyone played the game?
Okay fine then do a bit about the video here.