n. The tallent some of your buddies have developed to become completly pussy whipped. When they ditch the bros for the hoes on a consistant basis. In most cases the retracter is able to drop them again, but in some cases they dissappear forever. Just like your mother used to tell you if you make a face long enough it will stick, if you don't use them you lose them.
One of my "friends" has lost his manhood due to his retractable balls.