The clip comes from a 2021 commentary by Brazilian journalist Reinaldo Azevedo, responding to Senator Eduardo Girão's claim that the CoronaVac vaccine contained aborted fetuses. Azevedo's blunt dismissal, telling listeners to stop being dumb, was clipped from the longer broadcast and circulated as a standalone reaction sound. It spread among Brazilian social media users who wanted a quick, authoritative way to push back against vaccine misinformation and other implausible claims. Its appeal has lasted because the line is short, instantly understandable even without context, and fits almost any moment when someone repeats a debunked idea with confidence.