The diet caffeine free mountain dew meme was started by a extremely small you tuber called that one weird kid. He only used it a few times until he started using the meme more and more. The last video the meme was in was his last video. In that video he said that he was stuck in the middle of the woods with only a large supply of diet caffeine free mountain dew. No one every heard from him since.(i am not that one weird kid i am just using the name)