The origin of duh de detutz is not documented, and the phrase itself appears to be pure nonsense rather than a quote from a known character or show. It circulates as a short soundboard clip because the wording is easy to remember and hard to place, which makes it flexible for edits. Online, creators reuse it as a shorthand for a stalled brain, a derailed conversation, or a moment that deserves no real answer, and its three second length keeps it usable without retiming a scene.