This short phrase comes from everyday internet slang rather than a confirmed movie, game or show, with idk and ngl widely used in texts, chats and social posts long before soundboards picked it up. Clips built from casual speech like this spread through meme pages, Discord servers and short video edits, where a familiar line can be reused for almost any baffling situation. Its popularity rests on relatability, because almost everyone has reached a point where they have no answer left, and the clip says that in the language people already type daily.