Online, lá vai ele works as a short reaction phrase in Portuguese, roughly meaning there he goes, and it is shared on soundboards and in short video edits where a spoken line does the commenting for the creator. Because the phrase is simple and widely understood by Portuguese speakers, it travels easily between different clips without needing much context. Creators tend to reuse it for exits, entrances and unexpected appearances, which keeps it useful long after any single viral moment, since the joke is in the timing rather than a specific reference.