The bruh reaction grew out of everyday slang for brother and spread online as a short vocal clip used to express disbelief. Shorter versions circulated on Vine and YouTube in the mid 2010s before becoming a staple soundboard and meme edit sound. This stretched variant with the trailing sh sound is used the same way, just with extra emphasis for longer awkward pauses. It remains popular on TikTok, Discord and gaming streams because one flat syllable can replace a whole reaction sentence.