This reaction sound is widely used online as a comedic way to express disbelief, frustration or acceptance when something goes wrong. The elongated delivery is strongly associated with the catchphrase “sheeeit,” famously popularized by Clay Davis in HBO's The Wire during the 2000s, and short edits of that style spread across meme pages, short videos and soundboards. It remains popular because one stretched word can instantly sell a fail, bad decision or painfully obvious mistake, much like a bruh reaction.