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1.
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%
автор: Casey 11 июня 2003
 
2.
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.
автор: tradesman 21 ноября 2003
 
3.
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.
автор: Blueglowizard 18 апреля 2009
 
4.
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.
автор: skrilla 17 июня 2003
 
5.
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.
автор: tellitizaman 6 сентября 2010
 
6.
Doing something at your maximum effort. Running so fast that your testicles fall out of your shorts and become exposed.
The pole vaulter went balls out over the bar.
автор: the cheese man 18 декабря 2013
 
7.
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!"
автор: Dutch Grosse 29 сентября 2003