The shout comes from Cristiano Ronaldo's trademark goal celebration, in which he jumps, spins and shouts Siuuu, a sound fans have chanted back at stadiums around the world. It grew beyond football as clips of the celebration were shared on social media, remixed into edits and copied by players and fans, turning a single celebration into a shorthand for scoring and showing off. It remains popular because it is immediately familiar even without a picture, carrying the energy of a goal in barely a second.