The exact source of this clip is not tied to a well-known film, show or public figure, and it is best understood as a user-generated German vlog moment shared for its blunt humour. The phrase itself is colloquial German, with ni for nicht and Kopp for Kopf, giving it a regional, everyday feel that makes the insult sound affectionate rather than harsh. Online it circulates mainly as a short reaction sound, where creators reuse the five-second line to punctuate absurd behaviour, and its appeal rests on that mix of recognisable German dialect and instantly readable disbelief.