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When one flushes at any point during (midway through) "number two" as an attempt to reduce/diminish the overall smell.
One could request a "sympathy flush" from the individual in the adjoining stall of a restroom, should one experience an unpleasant odour. "Ummm...I think that merits/merited a sympathy flush. Dude - did you have mexican for lunch?"
by Kooky23 October 19, 2009
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