Bruh started as everyday slang for brother before it became a shorthand reaction online, spelled in Cyrillic as Брух on some soundboards. The short clip spread through Vine, YouTube edits and gaming chats in the mid 2010s, where a single deadpan word could replace a whole comment. It stayed popular because it fits almost any low stakes failure and is instantly understood across languages. Streamers, editors and group chats still use it as a quick, mild way to call out a silly moment without real hostility.