A moment in any Nintendo game when the entire world seems to have teamed up against you. Generally used in instances of multiple cheap items used upon a player in Mario Kart, especially in the third lap when less than 30 feet from the finish line and in first place.
"I was in first place until Nintendo Magic happened to me."
Friend 1: "Blue Shell, POW block, and lightning all at once?!? And ten feet to the finish! How the hell is that possible?!?!?
Friend 2: "Nintendo Magic"