Wat betekent dat is a common Dutch phrase meaning what does that mean, and as a sound clip it has circulated mainly among Dutch-speaking meme creators and soundboard users looking for a simple confused reaction. Because the wording is short, clear and easy to understand even for listeners who know only a little Dutch, it works well in short videos, reaction edits and group chats where a visual joke needs a spoken question. Its staying power comes from that everyday usefulness: confusion is a constant in online humour, so a plain spoken question never really goes out of date.