The Siu celebration is Cristiano Ronaldo's trademark goal celebration, a shout of the Spanish word for yes that he performs with a mid-air turn and landing. It became instantly recognisable through televised matches for Real Madrid and Juventus, where fans began chanting it back to him in stadiums around the world. Clips of the celebration spread across YouTube, TikTok and football edits, and gamers and creators adopted it as shorthand for scoring or winning. Its simplicity and energy keep it in constant use long after its first appearances on the pitch.