Poop Scar is similar to a skid mark in that it is a fecal stain which appears in one's underwear due to poor wiping or an explosive fart. The difference is that a Poop Scar will remain after washing the under garment.
Uncle Steve hurries home after work to make a satisfying poopscaroons. Then passes out on the bathroom floor from exhaustion passing that bowel winding masterpiece.
That’s some good ole dropping brown experience you made Grandmom.