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1.
The sudden feeling at your sphincter of having to emit waste very soon. This is a known side effect of a hangover, eating bad Indian food, and eating too many of those potato chips that contain the fat-substitute olestra.

Similar to santorum but no sex is involved.
After drinking heavily and eating a whole bag of those weird-tasting potato chips the night before, Henry awoke to a distrubing sense of fecal urgency.
by Artimus December 29, 2005