The clip comes from TikTok, where users upload short personal audios that friends reuse for their own birthday tributes. YB is a piece of internet slang popular in African diaspora and youth culture, used affectionately for a baby boy, a younger boyfriend or a close young friend. Because the audio is short and direct, it spread through birthday edits rather than any single viral video, and it is still picked up every year as creators look for a fresh, intimate greeting that sounds like it was made for their own person.