Mertens liedje appears online as a short, user-shared song snippet rather than a widely documented commercial release, so its exact original recording is not clearly established in public sources. The Dutch title simply means a song associated with the name Mertens, and the clip circulates mainly through soundboard and short-video communities where users reuse brief musical moments for jokes and edits. Its continued use comes from that brevity and familiarity: it is instantly recognisable to people who have heard it before, yet short enough to drop into almost any lighthearted post without needing context.