Arre bhaiya is a common everyday Hindi phrase, literally addressing an older brother, that has become a familiar reaction sound in Indian internet humour. Because it is short, expressive and easy to recognise even without translation, creators use it across short videos, memes and chat replies to signal surprise, disbelief or playful scolding. Its appeal comes from that everyday familiarity rather than a single famous scene, so it stays useful whenever a clip needs a quick, human reaction that feels casual and instantly understood.