Cristiano Ronaldo began using the Siu celebration during his time at Real Madrid, jumping, spinning in mid air and shouting as he landed with arms outstretched. He has said the word came from the Spanish 'si' for yes, shared with teammates before it became his trademark. Clips spread widely on YouTube, TikTok and football fan pages, with fans often writing it as Suuuuuuuuuuuuu in comments and edits. Bass boosted remixes followed, exaggerating the shout for memes, and the celebration remains instantly linked to Ronaldo and to scoring a decisive goal.