Ronaldo developed the Siu celebration during his time at Real Madrid, with a widely shared version coming from a 2014 pre-season match against Chelsea. He has explained that 'siu' comes from 'si', Spanish for yes, shouted as he jumps, spins in the air and lands with his arms out. Television broadcasts and fan recordings turned the moment into a chant copied in stadiums, then into a short clip shared across football edits, gaming videos and meme pages, where it now marks any confident celebration.