What is 5 knuckle shuffle?

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5 knuckle shuffle is a wrestling move, specifically a signature move of the WWE Champion John Cena. It involves the wrestler standing in front of their opponent, taunting them by waving their hand in front of their face and performing a series of "knuckle shuffles" on their chest before delivering a finishing move. The move is primarily used for entertainment purposes and has no real impact on the opponent's physical condition.