The line comes from Dragon Ball Z, where Vegeta uses a scouter to read Goku's power level and erupts in disbelief when it passes nine thousand. Fans clipped, remixed and reposted the shout across early video sites, turning a dramatic anime moment into a shorthand for any number that seems impossibly high. The decibels twist plays on that same exaggeration, treating volume itself as the power level. It survives because the reference is instantly recognisable even to people who have never watched the series.