You have never heard of the word "Yankee"? "Yanks" is a shortened form.
Fosters is advertised in the US as being "Australian for 'beer.'" This "definition" is obviously from an Australian, who is telling you that Australians call "beer" "beer."
And that they do not consider Fosters to be representative of actual Australian culture, but is only for tourists who think it is authentically "Australian" (because of the beer commercials they have seen back home in the US.)
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