Mass Confusion is originally from the game Ice Hockey for Nintendo. If you pushed all the buttons at once before the puck dropped, all the players would huddle in the middle, causing "Mass Confusion."
Self-explanatory. The more massive the confusion, the more likely it is to be called "Mass Confusion."
Cheng would like to note that mass confusion in ice hockey is part of a tradition to keep canadiadians occupied. Its sort of like "busting the sign" in golden axe. Mass confusion could also be considered a strategy to psyche out your opponent. It could also be considered strategic in game play. A big part of the game was who was taking the face off (apart from if u were using the keyboard or controller).