Ronaldo began using the celebration early in his Real Madrid years, jumping, spinning in mid air, and shouting Siu as he landed, a word drawn from the Spanish and Portuguese yes. Fans in stadiums soon joined in, making the shout echo around grounds during his time at Juventus, Manchester United, and with Portugal. Clips spread across YouTube, TikTok, and football fan pages in the late 2010s and early 2020s, where the isolated shout became a standalone reaction for success far beyond football itself.