The result of blood vessels breaking under the skin which is a common symptom of having way too much sex/masturbation. This turns the testicles a very dark grey/black color. Only really noticeable on White Males.
Contrary to the previous poster's definition, Nock a Mixon is not in New Jersey. It is in Kintnersville, PA. It is home to CCFA's Camp Guts and Glory in mid-August, and usually those crazy karate camp kids around the same time.