The phrase estouradão is Brazilian Portuguese slang for something turned up so loud it sounds blown out, which fits this bass-heavy take on the sigma meme. Sigma edits spread through TikTok, Reels and YouTube Shorts as a tongue-in-cheek shorthand for lone, unbothered confidence, usually paired with phonk beats and slow motion. This version leans into the joke by exaggerating the low end until it becomes the whole effect. It stays popular because the sound alone signals the edit style before any caption explains it.