ballsack mullet
the long scraggly pubic hair on the back of your nuts that you miss while shaving your scrotum. thus creating the look of a mullet cascading off your ballsack.
"Yo bro I was examining my balls after shaving and I noticed that I totally have a ballsack mullet!"
"Shave that shit now!"- Bro
"Shave that shit now!"- Bro