yam bag

scrotum; nutsack; fleshy, often hairy, pouch containing the testes. Popularized by comedian Andrew "Dice" Clay on the Opey and Anthony show.
> After delivering a devastating donkey-punch, I proceeded to pull out my mule and paint a lovely map o' Hawaii on her back in a flattering shade of banana-juice. I then treated her to a Roman War Helmet a.k.a the Gonzo, in where I draped my yambag over her eye-sockets and mule over her nose.