a device encircling the scrotum above the testicles that pushes the testicles away from the body. Most stretchers are made of soft leather, usually pushing the testicles out or down an extra 1-3 inches, but some afficionados can take as much as 10 inches. Lately, also made of heavy metal rings or joined semi-circles. Mostly gay use. Can produce a very erotic sensation both to the testicles and to the testicle cords.
Bob's ball stretcher made his nuts whack agaist his thighs as he walked.