The chant comes from Cristiano Ronaldo, who turned Siuuu into his trademark goal celebration, shouting it while jumping and spinning in mid-air before landing with his arms out. Fans in stadiums soon began chanting it back at him, and clips of the celebration spread across football broadcasts, social media and fan edits. It later became a shorthand meme for scoring, winning or showing confidence, used far beyond football in gaming, reaction videos and celebration compilations because the sound alone is instantly recognisable.