Yang cong is simply the Mandarin Chinese word for onion, and this short recording circulates online purely as a soundboard clip rather than as a song or film quote. Its life online is built on repetition and randomness, with users dropping the single word into chats, edits and live streams where it makes no logical sense. That out of place quality is why it endures, similar to other one word meme sounds that gain humour every time they interrupt an unrelated moment without explanation or context.