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An extremely poor performance when a good one is needed--can occur in any sport or area of endeavor.

(Shitting one's pants, usually figuratively, but could be literally)
He needed to put the ball on the green, but shanked it into the pond--his second pantsloader that round.

The politician seemed to present a cogent explanation, but came out with a real pantsloader when he thought the mike was off.
by Dr. Foo August 13, 2010
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