Cristiano Ronaldo, the Portuguese forward, popularised the Siu celebration during his time at Real Madrid, spinning in the air and shouting si, Spanish for yes, as he landed. Fans in stadiums began chanting it back, and clips spread through match highlights, football games and social media edits. Online the shout was remixed, pitched and misspelled in playful ways, including Shewy, turning a stadium ritual into a reusable reaction sound for wins far beyond football itself today.