This is a serious condition that effects many athletes, it occurs when a sprinter wears very short shorts and then sprints. What happens is his nuts flap outside the shorts and are clearly visible to all. It is disgusting and must be prevented at all costs.
When Calin jumped long jump he always went balls out and never wore spandex underneath his shorts, hey it pays to advertise.
by ShoesRBad March 20, 2003
Originally referred to the governor on old steam engines that had two ball that rotated across one another that would control speed depending on how fast they spun. Balls out meant going full speed or power.
That old steam tractor was going balls out.
by tradesman November 21, 2003
This refers to the governor on a steam engine. Two heavy balls are attached to the engine so that as engine speed increases, the centrifigal force of the flywheel causes the balls to rise. As the balls top out, they govern (limit) the engine, thereby controlling maximum engine speed. "Balls out," then, refers to running the engine at maximum speed.
by Blueglowizard April 18, 2009
Old timey terminology: on steam engines, they had steel balls in there that resricted steam flow. When the conductor was ready to pick up speed, he'd yell "Balls out!", signaling the help to do just that, thereby letting them haul some ass.
"Balls out! We got to mow down those hobos!"
by Dutch Grosse September 29, 2003