from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adverb US, idiomatic, slang
Full throttle; maximum speed.
- adverb US, idiomatic
Maximum effortor commitment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
Perhaps coined by pilots whose throttle levers had round, ball-like tops, and for whom putting the "balls to the wall" (the firewall of the aircraft) meant making the aircraft fly as quickly as possible.
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