Ndak tau is a colloquial Indonesian spelling of nggak tahu, meaning I do not know, widely used in casual chat and comments. The clip itself has no confirmed public source, so it circulates as a user-uploaded soundboard snippet rather than a quote from a known show or film. Its appeal comes from brevity and tone, making it useful as a universal shrug for reaction videos, meme edits and WhatsApp-style jokes. Because the phrase is short and instantly understood by Indonesian speakers, it keeps getting reused.