Short for 'burning ball syndrome'. Many times is a case of jock itch. However, may also be a symptom of a std (get it checked son). Common amongst athletes and beach gowers (sand in the shorts, ouch). If you get bbs, gold bond powder is your best friend. Frequent sufferers of bbs generally keep gold bond in their locker or bathroom.
Ex 1: "Dude, I was free-balling it at the beach this weekend and got a wicked case of bbs."
Ex 2: (Girl) "What's that on your nuts?" (Guy) "Don't stop baby. It's just some bbs."