User blog comment:SalaComMander/Knuckles Broke the Fourth Wall/@comment-1953321-20100911021746/@comment-26265282-20100913121157

It's when in a movie, game, or comic, the characters realize that they are in something fictional, such as in Pokemon the Movie 3 when Meowth says: "Do you think we'll get a bigger part in the next movie?" and when the same character says to Ash: "If anything happened to you, we'd be outta show business!" The fourth wall is literally the side the viewer/gamer/reader is looking thru.