Knokke is a wealthy seaside resort on Belgium's North Sea coast, long associated with luxury villas, beach clubs and a glamorous summer crowd, and the phrase rich Knokke boy playfully describes its young, affluent locals. The sound began circulating as a short meme clip on soundboards and social platforms, where creators use it as a tongue-in-cheek label for over-the-top displays of wealth. Because it is so brief, it works as a quick tag or punchline, and it keeps appearing in holiday edits, flexing videos and jokes about Belgian coastal culture.