The Bat Tuck is when you pull your testicles over your penis(stretching them like a Batwing, hence the name) over the tip of the flaccid penis, this anchors your testicles to your body, avoiding the irritation of perspiring testicles, itchy testicles, etc. Or at least avoiding the the most intense effects of leaving your testicles in their normal position.
by Dookamanooka May 1, 2014