To exude tremendous effort, to try extremely hard.
I decided to slack off and get a B in the class, but Ross went balls out and got a 100%
po Casey Јун 11, 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.
po tradesman Новембар 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.
The engineer was running the train at a "balls out" pace while trying to make up time.
po Blueglowizard Април 18, 2009
giving your all in a certain situation, being courageous
You should've seen me out there, I started to choke but then I went totally balls out.
po skrilla Јун 17, 2003
a unit of measure regarding to the top end speed of something.
when asked by the officer how fast he was going bill replied "im not sure but it was pretty ballsout.
po tellitizaman Септембар 6, 2010
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!"
po Dutch Grosse Септембар 29, 2003
When your testicles are out of your pants through the zipper of your jeans.
"dude, your ballsout."
po TheLiriValley Април 13, 2010