A century later, the phrase was popularized the world over in a tourism ad campaign featuring Paul Hogan, the Australian actor who would later gain international fame as Crocodile Dundee.

Australians have a long tradition of abbreviating and slackening words and phrases, particularly by adding “ie” to the end.

“Aussie” appears in references from World War I. A book by Gertrude Moberly, recounting the experiences of a nurse, described a “farewell dance for the boys going home to ‘Aussie’ tomorrow.”

And Australians always have their “mates.” The nation’s unique camaraderie, known as mateship, is especially evident during commemorations of the Australian and New Zealand Army Corps (or Anzacs), the World War I-era fighting force.

Adam Baidawi contributed reporting.

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