Balls out 

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%

Balls out by Casey June 11, 2003

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.

balls out by Blueglowizard April 18, 2009

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.

balls out by tradesman November 21, 2003

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.

balls out by skrilla June 17, 2003

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!"

balls out by Dutch Grosse September 29, 2003

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!

balls out by Alphadestrious January 3, 2004

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

Balls Out by better than tessa September 5, 2011