Ronaldo first performed the celebration in 2013 while at Real Madrid, later explaining that 'si' means 'yes' in Spanish and Portuguese, shouted as a burst of joy after scoring. The jump, spin and extended siuuuu chant quickly became his signature, echoed by stadiums full of fans around the world. Like other football goal chants, it crossed from the pitch into internet culture, soundboards and memes, usually paired with crowd cheering. A decade on, it remains the most imitated goal celebration in the sport.