Extreme; extremely great.
He's making a balls-out run for Motor City by nightfall.
Descriptive of the use of a centrifugal governor at maximum speed, corresponding to full throttle.
With great abandon.
At the fastest possible speed.
Usually said to be from the maximum-speed state of a ball governor, whose balls are swung out to the near-horizontal position. Neither balls-out nor balls to the wall is connected with the vulgar sens...
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