The twisted result of rolling your underwear off your ass, down your legs, and onto the floor. (Usually kicked off one foot toward hamper.) Not recommended for human consumption, however some dogs are known to savor the flavor.
You know its time to clean when there are underwear pretzels all over your bedroom floor!
A Navy buddy of mine, Don Armstrong (RIP buddy) had terrible hemorrhoids-- they would bleed and make perfect doll-sized kiss marks inside his underwear.
Don's Wife: "Don! You sick fuck! Did you pay a midget to wear lipstick and kiss your goddamn underwear?"
Don: "No honey... those are from my hemorrhoids."
Don's Wife: "... you mean this is actually... blood?"
Don: "It's best to think of them as Underwear Kisses."