look up any word, like the eiffel tower:
 
20.
Whenever balls, nuts, or testicles are showing and are bouncing or swaying in the wind. See flapnut
Little Jimmy found it funny to have his balls out in church, little Sally shit her pants in the excitement.
by Alexei March 20, 2003
 
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%
by Casey June 11, 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.
by tradesman November 21, 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.
by Blueglowizard April 18, 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.
by skrilla June 17, 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.
by tellitizaman September 06, 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.
by the cheese man December 18, 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!"
by Dutch Grosse September 29, 2003