Cristiano Ronaldo made the short 'Siu' shout part of his trademark goal celebration, turning in mid-air and landing with arms outstretched as crowds joined in with the same chant. Television broadcasts and stadium videos carried it far beyond football, and social media edits, memes and reaction clips turned the longer 'Suiii' version into a universal signal for scoring, winning or showing off. It remains popular because the sound needs no explanation: one shout instantly signals triumph, confidence and a big moment.