Koziulia is the transliteration of the Russian word козюля, a childish everyday term for a booger from a nose. The clip circulates online under its transliterated slug because the original title is written in Cyrillic, which makes koziulia, kozulya and kozulia the spellings searchers type in Latin letters. It has spread as a niche meme sound rather than a scene tied to a known film or show, shared in short edits where a single gross word does the work of a caption and a reaction at once.