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Residue, left on a toilet seat, usually in the shape of a "Y" (reflecting the reoccurring placement of an unwashed ass-crack, from one, or multiple persons), that collects over time, due to an insufficient cleaning/maintenance routine of the toilet in question; most commonly seen in gas station stalls. The composition of Bumslaw may vary; the most common elements include: poop, ass pubes, accumulated sweat resin (aka: salt cream), hemroidal or vaginal medication residue, blood, lubricant, and fuzz from undergarments.
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