Ich weiß es nicht is a standard German sentence meaning I do not know, long used in everyday speech long before it became a soundboard clip. As a short television excerpt it began circulating online as a reaction sound, where the foreign language adds extra comic distance for non German speakers and instant recognition for German speakers. Its appeal is its universality, since everyone has faced a question they simply cannot answer, and the clip packages that moment into a few seconds that can be dropped into chats, streams and edits without any setup or explanation needed.