Invasive Feces

Completely unexpected remnant fecal matter, commonly referred to as skid marks, that appear in the gusset of one's grunders without warning. Despite one believe that they had thoroughly cleaned their bum and under carriage post defecation, Invasive Feces still appears.

Carl's girlfriend Carol was catching up on laundry. She began sorting the whites and darks when she spotted a excessive amount of Invasive Feces in one of the pairs of Carl's grunders. She removed the pair from the wash and left it next to Carl's bed pillow.