The phrase is Dutch for 'oh, it's on,' and the clip is best understood as a reaction sound rather than a line from a known film, show or song. With no widely documented original source, it circulates mainly through user-made soundboards and short-form prank edits, where its appeal is the instantly recognisable situation it describes. That everyday setup, realising a device was recording all along, keeps it useful across languages, even for viewers who do not speak Dutch, because the tone carries the joke.