Cristiano Ronaldo popularised the siu celebration during his time at Real Madrid, jumping, turning in the air and shouting a drawn-out version of the Portuguese word for yes as he landed. Clips of the shout spread widely on social media and in football fan edits, where the spelling sium became common in Italian meme circles. Short echoing edits like this one turned the stadium moment into a reusable reaction sound, and it remains popular for goals, wins and ironic celebrations online.