Ni yo sé is a Spanish expression meaning not even I know, and the clip circulates mainly as a short reaction audio on TikTok, where creators reuse it to punctuate moments they cannot explain. No single film, show or celebrity performance has been reliably identified as its source, so its popularity rests on the phrase itself rather than a famous scene. Because the wording is simple and widely understood across Spanish-speaking audiences, it travels easily between videos, comments and edits, and it continues to appear whenever a creator wants a quick, self-aware response to something baffling.