Zoeira is Brazilian internet slang for relentless playful teasing, and this phrase became a shareable shorthand inside that culture. Clips like this spread mainly through WhatsApp groups, soundboards and short video edits, where a two second voice line can be reused for endless different situations. Because mula carries the double sense of the animal and a foolish person, Portuguese speakers instantly get the insult and the joke. Its brevity and familiar roast tone have kept it circulating as a generic callout sound rather than a line tied to one scene.