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10.
When you take a risk, or doing something that you normally would be not inclined to do; doing something dangerous some may see as foolish or 'crazy'; just doing 'it'
When crossing a busy street to meet his friends, Ian saw a truck coming at him at a high velocity, instead of stopping and waiting for the truck to pass by, Ian decided to go balls to the walls and cross the street anyway, impressing the friends he was trying to catch up with.
by Omega_Pirate December 26, 2006
 
1.
term used by pilots. when accelerating quickly, the throttle is pushed all the way to the panel and the throttle lever (ball) actually touches the panel (wall). Hence, balls to the wall.
by Geoff Ahn September 30, 2003
 
2.
To push to the limit, go all out, full speed.
A very colorful phrase, one needs to be careful when using "balls to the wall". Although its real origin is very benign, mos people assume it is a reference to testicles.
In fact it is from fighter planes. The "balls" are knobs atop the plane's throttle control. Pushing the throttle all the way forward, to the wall of the cockpit, is to apply full throttle.
"balls to the walls"
by blahblahblah March 30, 2005
 
3.
To go at full (unregulated) power

Steam engines had mechanical regulators that consisted of a pair of hinged lever arms with a ball on the end of each arm, as the engine sped up the centrifugal force caused the arms to raise up closing a valve. If you adjust the regulator so that the arms go to horizontal (with the balls pointing to the wall) without closing the valve you are not limiting the speed of the engine.
When the captain called for balls to the wall, we stoked the fire and pushed the throttle to full.
by Pat Reen January 06, 2005
 
4.
Term used to describe an intense, or extreme situation.

Origin: In aviation, the throttles (or power levers) are usually sticks with ball shaped ends. When a pilot wants full power, he moves the throttle forward towards the front wall of the cockpit. Thus, "balls to the walls" meant "full power".
When Dr. Smith's patient suffered a cardiac arrest, the code team went balls to the walls.
by davechandler March 07, 2005
 
5.
Originally a military term for pushing maximum G-Forces in a jetfighter aircraft, as in pushing the ball of a throttle as high up as it will go (virtually touching the wall of the dashboard).

Fast; hectic; pushed to the limits
We hit the road, balls to the wall; The fighter let loose on his opponent, balls to the wall.
by Greg Novak November 15, 2003
 
6.
This term significantly predates airplanes all together. The term "balls to the wall" originated with James Watt's invention of the centrifugal governor used on early steam engines (circa 1774, well before the Wright brothers at Kitty Hawk). Over the years, these types of governors were adapted for use on various other types of engines, including many aircraft engines. Some aircraft have a ball shape at the end of the throttle control, which is actually a clever reference to the governor mechanism, no doubt conceived by a witty designer. It is easy to see where one could get the (wrong) impression that "balls to the wall" would indicate the position of the throttle lever, when in fact, the term, strictly speaking, is a reference to the position of the weights on the governor.
Increase engine speed! Balls to the wall!
by engineering etymologist July 19, 2010
 
7.
Intense, extreme, to the max. The phrase comes from olde-fashioned steam engines; basically, they had two weighted balls attached to a vertical shaft which was connected to the engine. As the engine speed increased, these two balls would be raised higher because of centrifugal force! At top speed, they would be parallel to the ground, nearly touching the "walls" of the shaft! Hence, "balls to the wall."
"Balls to the wall" is a phrase with an interesting origin. Remember, when it comes to etymologies, the best story wins!
by Testicles! December 19, 2008