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E4tMyPower is a trash-talking move in online games like RuneScape when one player totally destroys another player. It’s also the username of a top-level pee kayer who loves to flex.
E4tMyPower just stole my loot and ran off laughing.
I got E4tMyPowered in the middle of a boss fight.
E4tMyPower logged on and my character died instantly.