Bla bla bla has been used in everyday speech for decades as shorthand for predictable or empty talk, long before short soundboard clips existed. Online, this babbling version spread as a reaction meme because it needs no setup and translates across languages, the repeated syllables acting like a spoken eye roll. Creators reuse it in video edits, group chats and livestream moments to signal they are tuning someone out, and its simplicity keeps it in circulation alongside other short vocal reaction sounds that puncture long speeches instantly.