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7. balls out
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!"
1. Balls out
February 18, 2010 Urban Word of the Day
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 Jun 11, 2003 share this add a video
2. balls out
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 Nov 21, 2003 share this add a video
3. balls out
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 Jun 17, 2003 share this add a video
4. balls out
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.
5. Balls Out
Balls Out means many things. 1. Literal balls out of pants 2. No fear 3. Goin for it 100%
it's what we are. Steel Panther is Balls Out.

- Stix
6. balls out
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!