When one is under great stress and they fail to perform and instead completely shit their pants. Like Joe Flacco does every time he playes the Steelers.
Joe Flacco tried to show up to Heinz Field in the playoffs but Dick LeBeau gave him bad Flacculence. He Flacculated all over the place.

Fred went to the club to hook up with Julie W. but he had bad flacculence and struck out.
by fred-berg January 16, 2011
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To shit one's pants in the big game instead of performing under pressure. Just like Joe Flacco every time he plays the Steelers.
Dick LeBeau called all the right plays and made the Ravens QB flacculate all over the place in the game today.

Fred thought he would win big at the poker tables, but he got bad flacculence and flacculated all of his money away.
by fred_berg January 16, 2011
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