The line comes from Dragon Ball Z, where Vegeta, reading Goku's power level on his scouter, shouts in disbelief that it is over 9000. The English dub delivery became an internet meme in the mid-2000s, spreading through remix videos, reaction edits and gaming clips that used the number as shorthand for something absurdly powerful. Boosted versions, with the volume pushed into distortion, later became popular in short-form edits for an extra punch. It endures because the phrase is short, instantly recognisable and easy to drop into any moment of exaggerated surprise.