When your balls are hanging extremely low, most likely on a hot day, and you shake your hips side to side until your balls wrap around your penis resembling a Tether Ball Pole. This must be done with no hands, making it an accomplishment worth sharing with all your friends.
Sam came in from playing soccer when it was 100 degrees out, took off his gym shorts. He quickly shook his hips side to side repeatedly until his balls had wrapped around this dick. He was proud because he had just done some extreme Tether Balling.