Aussieness - extremely Australian, usually defined by: A lot of alcohol consumption, Backyard sports, alcohol consumption, watching the footy, cooking snags, and more alcohol consumption.

Oi! Oi! Oi!

Used by Australians in most of the circumstances where americans may chant U-S-A U-S-A.
This may be at one of the frequent moments of a fantastic sporting performance by an Aussie, or when nothing's happening.
Believed to have been derived from the Welsh 'Oggie Oggie Oggie - Oi Oi Oi!', which might actually mean something...
Seems to have peaked during the 2000 sydney olympics.
Occasionally repeated several times consecutively, the 'Oi' chorus growing louder with each calling.

Used by Australians usually at sporting events or to display Australian Pride. Or when having fun with other Aussies
The full text is:

Aussie Aussie Aussie,
Oiy Oiy Oiy

usually repeated several times

An exclamation followed by the response: Oi! Oi! Oi!

Made by Australians when feeling particularly patriotic especially during sporting events.

Also heard frequently voiced by Australians overseas. For example, when visiting Aussie themed pubs in London, England.

Exact origin unknown but early instances were observed during Olympic swimming events prior to 2000.

Similar to the 80's Olympic chant of "U.S.A! U.S.A! U.S.A!", derived from the 'Oggy! Oggy! Oggy!' original. A highly embarrassing chant enjoyed particularly by Sydneysiders during the 2000 Sydney Olympics ad nauseum. Also used at the Cronulla beach wars. The chant was used to conjure up corny, smiley gung-ho 'Australianess' as opposed to being "un-Australian". When sung backwards, sounds like:

-"White Australia policy!"
-"Bring it back!".

Aussies are Australian people it's pretty much just a nickname