Geleng is an Indonesian and Malay word for shaking the head side to side, the gesture for no, disbelief or baffled refusal. Online, geleng geleng became shorthand for that same reaction in edit form, repeated twice for comic emphasis. Creators use it across short videos, meme edits and reaction posts when a character, friend or clip does something so questionable that commentary feels unnecessary. Its appeal is how instantly it translates across languages, pairing a familiar physical gesture with a catchy repeated phrase that viewers remember after one listen.