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.