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In page Australian English:

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Diminutives and hypocorisms are common and are often used to indicate familiarity.[1] Some common examples are arvo (afternoon), barbie (barbecue), smoko (cigarette break), Aussie (Australian) and Straya (Australia). This may also be done with people's names to create nicknames (other English speaking countries create similar diminutives). For example, "Gazza" from Gary, or "Smitty" from John Smith. The use of the suffix -o originates in Irish: ó,[citation needed] which is both a postclitic and a suffix with much the same meaning as in Australian English.[citation needed]