The clip takes its name from Dutch football commentator Sierd de Vos and koekoek, the Dutch word for cuckoo. It is a very short excerpt, lasting under two seconds, and it is shared as a small soundboard clip. Online, listeners use it mainly as a comic sports reaction, especially in Dutch football edits and social clips where a sudden cuckoo call adds absurdity to a failed play or surprising incident. Its appeal comes from the contrast between a familiar commentary voice and an unexpected bird sound.