The "Siuuu" celebration has become an iconic symbol of victory in soccer, with Ronaldo and many others replicating it after scoring goals. Football Celebration, Siuuu Celebration. Kasi Flava ...

But since 2013, those goals have been followed a now infamous celebration called the Siuuu. Ronaldo first did the celebration at Miami's Hard Rock Stadium in a preseaon friendly against Chelsea.

Tennis fans in the land down under have started shouting a chant sounding similar to "boo," one that is used in soccer. The crowd is yelling "Siuuu!" during various matches in this year's tournament.