What it means
To pull something off in a single attempt or take down a target in one hit, no second tries needed. Gaming gave us one-shotting a boss, and it carries over to nailing a recipe first go or passing the test one-shot. The flex is in the clean single try.
Usage examples
"She one-shot the parallel park with the whole street watching."
"Nailed the soufflé one-shot, never managing that again."
"He one-shot his driving test and walked out acting calm like that wasn't wizard behaviour."
"I thought the shelf would take three tries, but Mum one-shot it and told me to pass the screws."
Where it comes from
It comes straight out of gaming talk, where to one-shot an enemy means dropping them with a single hit. From there it spilled into everyday chat for anything done clean on the first go, especially when there's a bit of flex in how effortless it looked.
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