The Dirty upper is Earthworm Jim's anti air move in ClayFighter 63 1/3 and ClayFighter: Sculptor's Cut. He leaps into the air and does an uppercut, kind of like Ryu's Shoryuken. This may be a reference to Megaman in Marvel vs Capcom: when he was introduced into a fighting game from a platformer, they gave him the move of their most famous fighting game character. When Earthworm Jim, a character used to platforming games was put into a fighting game, interplay gave him the shoryuken.
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