A sudden (and often expected) demonstration of complete ineptitude by an athlete at a critical moment in a game.
Brett Favre has chronic Neuroflatulence, which causes him to throw interceptions at the most critical moments in a game.

This was most recently demonstrated when he threw an interception in the closing seconds of the the 2010 NFC Championship against New Orleans. This prevented Minnesota from kicking a potential game winning field goal.
by HOMEYSIMPSON January 25, 2010
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