1. A person who sucks, licks or fondles the balls/sack very, very well, goes above and beyond, and is excited to do it.
2. A male who takes very good care of his sack by trimming, shaving, moisturizing, and/or using baby powder.
Ex 1: "Felicia is such a sack diva; she often requests a chocolate coated T-bag."
Ex 2: "Chad, you're a sack diva. You spend more time grooming your sack than you do f*cking."