Bruh began as informal slang for brother before becoming a staple reaction word across social media, where its flat, unimpressed tone made it perfect for short videos. It spread through Vine-era reaction clips, gaming streams and TikTok edits, where creators used it to punctuate fails, plot twists and awkward reveals without needing any explanation. Because the single word is instantly understood and needs no context, it has stayed in circulation long after many longer memes faded, especially in gaming and reaction content where timing matters more than dialogue.