A testicular nubbin is the residual tissue of the human testis after a supposed perinatal vascular accident involving the testicular blood supply. The blood supply of the testis twists (called torsion) thereby cutting off the blood supply to the testis and results in testicular atrophy (shrinking).
A testicular nubbin is the remaining tissue from a human testis following a supposed perinatal vascular accident where the testicular blood supply becomes twisted, cutting off the blood flow and causing testicular atrophy.