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.
About this sound
Koziulia is a Russian meme sound clip named for a booger, used as a gross-out joke in edits, chats and reaction videos for silly disgusting moments.
This clip turns the Russian word koziulia, meaning a dried booger, into the whole punchline. The humor comes from how childish and slightly disgusting the word itself sounds, even to listeners who do not speak Russian. Played over an ordinary face, a close up, or a messy moment, it instantly labels whatever is on screen as gross, silly, and a little proud of it. The length lets the gag sit and get more awkward instead of passing in a blink, which makes the reaction feel bigger and more ridiculous than the moment deserves in edits.