Top definition
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%
by Casey June 11, 2003
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2
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.
by Blueglowizard April 18, 2009
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3
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
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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.
by skrilla June 17, 2003
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5
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
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6
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.
by tellitizaman September 06, 2010
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7
When things get really tough or crazy, and one has to try harder to accomplish a goal.
Holy shit, the football team scored a point under a minute on the 4th quarter! The other team has no other choice but to go balls out, dude!
by Alphadestrious January 03, 2004
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The vengeful act of crapping on a lover's chest while they sleep.

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