Rather than join the United States of Mexico in adopting a name that won’t make a difference, the easier way for Australia to subvert chants of “USA! USA!” is through appropriate use of Syncopation. As follows:
A US!A US!A US!A US!
This is not to be confused with German “Aus! Aus! Aus! Das Spiel ist Aus!”, for when Germany won the World Cup in 1954.
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Really, Quora. My answer needs to be longer. OK, I tried it out on an American friend living here, and she was suitably annoyed. (The A-U-S version, not the Aus! Aus! version.) Does that help?