bang for the buck

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bang for the buck (uncountable)

  1. (idiomatic) Efficiency; cost-effectiveness; value.
    Do you think he would get as much bang for the buck out of a fancier, more expensive car?

Usage notes[edit]

Vulgar World War II GI (general infantry) slang for liberty activities of a sexual nature. Seeking the best bang for the buck, i.e., maximizing sexual gratification for the least amount of money, thereby saving his money for other purchases (drink/food).