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22.
Acronym for Super Itchy Bunghole Syndrome, usually brought on by wearing the wrong underwear on a really hot day while moving furniture up three flights of steps with a raging case of diarrhea.

Best cured by using a medicated powder.

Related to Swamp Ass, but you're inclined to scratch.
Honey, will you please powder my bunghole for me? I've got a nasty case of SIBS.
by Latrini May 09, 2005