EXAMPLES FROM THE WEB FOR BALLS
Mix the cream and salt with the cheese and shape into balls.
He moved with alert assurance, lithely balanced on the balls of his feet, noiselessly.
The balls experimented on were a new set obtained from Mr. Bown.
We stuffed the pink dainties with mint, and baked them in balls of clay.
While he yet spake, two balls entered his heart, and he fell dead.
The more the season for balls advances, the more indolent you become.
But suddenly two shots resounded, and Hatteras felt the balls graze his head.
He had only sufficient powder left to load three times, and he had just three balls.
Because you never visit us and, most likely, there will not be many more of these balls.
By means of these hooks the balls were fastened to the jackets of the adventurers.
WORD ORIGIN
"testicles," early 14c., from plural of ball (n.1). See also ballocks. Meaning "courage, nerve" is from 1928. Balls to the wall, however, probably is from World War II Air Forces slang, from the ball that topped the aircraft throttle, thrust to the bulkhead of the cockpit to attain full speed. Ball-busting "difficult" is first recorded 1944; ball-buster, disparaging for "dominant female," is from 1974.