Short vocal stings like this spread through user generated soundboards and short video edits, where creators reuse simple syllable sounds as reusable punchlines. Unlike the more dramatic dun dun dunnnnnnnn sting used for shocking twists, dah duh duh is treated as the sillier, lighter cousin, signalling that nothing serious has actually happened. Its appeal comes from how recognisable the rhythm is even without words, so editors can drop it into gaming clips, pranks and reaction posts and audiences instantly read the tone as playful mockery rather than real drama or tension.