shit-stained ballz
When your banging a chick, who didn't wipe her ass good after she took a massive dump .. and your saggy balls are smacking her dirty asshole while fucking her pussy ...this is when you get "shit-stained ballz".
Dam bro, becky needs to start wiping her ass after she takes a shit, I pounded her pussy last night ..and got a bad case of "shit-stained ballz"