Both "Australian" and "Aussie" refer to people or things from Australia, but "Australian" is the formal term, while "Aussie" is a popular, informal, and affectionate nickname for the people, used commonly in casual speech, especially during sports or to show camaraderie, though never for the country itself (which is "Australia" or "Oz").
Australians, colloquially known as Aussies, are the citizens, nationals and individuals associated with the country of Australia.
"Aussie Aussie Aussie, Oi Oi Oi" is a cheer or chant often performed at Australian sport events. It is a variation of the "Oggy Oggy Oggy, oi oi oi" chant used by both football and rugby union fans in Great Britain from the 1960s onwards. It is usually performed by a crowd uniting to support a sports team or athlete.
It simply means Australian, someone from Australia. So when Australian people refer to themselves, they say Aussies do so and so.
White Australian
In 1973 the Act was renamed the Australian Citizenship Act. It was not until 1984 that Australian citizens ceased to be British subjects. The relationship between citizens and government is blurred by the absence of a clear definition of Australian citizenship, its rights and obligations.
Oi, Oi, Oi! is a popular Australian patriotic cheer or chant often performed at international sporting events that involve an Australian national team.
Other less common nicknames include "Straya" ("Australia" pronounced in an exaggerated Strine manner), and "Aussie", which is usually used as a demonym, but occasionally extended to the country as a whole (especially in New Zealand).
An Australian classic, “no worries” is often said instead of “that's alright” or “it was no trouble”. Similarly, you might hear “no dramas”, which means the same thing. If you thank someone for helping you and they say “no worries” or “no dramas” it means it was no problem for them to assist you.
Tin-miners' wives or pasty sellers supposedly shouted "Oggy Oggy Oggy" – the response from any hungry miner or labourer would be Oi!, Oi!, Oi!. The chant is also the chorus of a folk song and has always been heard at Cornish rugby matches so this seem another possible origin.
The Americans favour the spelling cozy, while the British prefer cosy. Both spellings are used in Canada. A well-insulated house is cozy (or cosy) all winter long.
At the 2021 census, the most commonly nominated Anglo-Celtic ancestries were: English Australian: 8,395,928. Irish Australian: 2,410,833. Scottish Australian: 2,176,777.
While Australia has no official language, English is the first language of the majority of the population, and has been entrenched as the de facto national language since the onset of British settlement, being the only language spoken in the home for 72% of Australians in 2021.