The title is Chinese, with yan jing meaning eyes and jiu jiu mimicking a small chirping or squeaking sound, which explains why the clip is used for wide-eyed, sparkling reactions rather than speech or music. With a runtime of just over half a second, it fits the fast pace of short-form edits, where a single tiny effect can sell a glance, a blush or a moment of surprise. It has circulated as a small reaction sound for cute and anime-style content, and it remains useful precisely because it is brief, recognisable and easy to place.