Sigma comes from internet slang for a self-reliant lone-wolf archetype that spread through meme edits in the early 2020s, often contrasted with alpha and beta labels. Estourada is Brazilian Portuguese slang for audio that is peaked and distorted from being too loud. Combined, the name describes a meme format shared heavily in WhatsApp groups, similar in spirit to WhatsApp Bass Boosted clips. Users repost it as a shorthand reaction, where the blown-out volume signals confidence played for laughs rather than any specific song or scene.