Sudden deflations of tires; also large, exciting celebrations or parties; or the eruption of oil or gas from a well.
From 'blow' + 'out' (outward, completely). Became common in early 1900s with automobile tires, later extended to social celebrations and oil drilling.
A car tire 'blowout' happens at exactly 60 mph on a highway to ruin your day, but a 'blowout' party is meant to be unforgettable—same word, completely opposite vibes!
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