With no single famous scene behind it, bla bla bla la la la works as a universal shorthand for not listening, which is why it has found a home on soundboards and in short-form edits. The chant mimics the way people sing over unwanted noise, so viewers understand the joke at once without needing a reference. Editors drop it over lectures, rants and overlong explanations to signal boredom or defiance, and its brief length makes it easy to loop or place at the exact moment attention drifts. That instant readability keeps it in regular use.