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Essentially the inability to control one's bowels from both openings (mouth and anus) simultaneously. Usually brought about by the ingestion of improperly prepared food containing harmful bacteria or allergens.
Dave: Did you hear what happened to Steiny out in India?

Josh: Yeah, he shat and barfed all over his bed after he caught ass-and-mouth disease from that street vendor!
by PME InfoSource April 25, 2007
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