Attention collectors - the Great Aussie Coin Hunt is back, so you'd better get to your local post office, before it says hooroo.
The popular Australia Post promotion has returned and an all-new set of 26 $1 coins have been released, in partnership with the Royal Australian Mint.
The series covers an A-Z of Australiana, with each coin in the limited edition series dedicated to a letter of the alphabet which represents a word, phrase or name that is quintessentially Aussie.
The series covers colloquialisms, Aussie animals, popular destinations and words, names, and references which are synonymous with our culture.
To celebrate its release, we've selected three popular words or sayings which feature in the series and have taken a look at their origins.
A is for Aussie, Aussie Aussie: Anybody who has been to a popular sporting event, or even a school athletics carnival over the past 30 or so years would recognise this chant, but where did it actually come from?
Canberra University students Andrew Walsh, David Garnier, Tim Hogan, Graeme Marshallsea and lan Wakeling have laid claims to being the first Aussies to bellow the patriotic cry at a cricket test match on Australia Day in 1989.
But research suggests its origins are actually British. England association football and rugby fans had been using a strikingly similar Oggy, Oggy, Oggy chant from the 1970s.
The chant may actually be much older, with members of the British Navy claiming to have used a variation since World War II.
Englishman Roy Knox claims to have first used the Oggy chant in Australia while playing for the Box Hill Rugby Club in Melbourne in the late 1960s.
H is for Hooroo: There's no more Aussie way to say see you later, but this popular colloquialism may have actually come from Britain.
One suggestion of the word's origin suggests it was derived from the word hooray, or hurray, which is thought to have been used by Brits to celebrate the end of their day at work or school as far back as the 1700s.
J is for Jumbuck: We all know this word from Banjo Patersons' use of it in his classic bush ballad Waltzing Matilda.
It may have actually been coined by Aboriginal people, with reports of its use as early as the early to mid 1800s.
The etymology of the word is unknown. One writer in a 1896 edition of The Bulletin suggested it meant "the white mist preceding a shower, to which a flock of sheep bore a strong resemblance".
What else can I find in the series?
The series also celebrates cockatoos, the Great Ocean Road, Irukandji jellyfish, Luna Park in Melbourne, surfing, vanilla slice and home-grown companies such as Darrell Lea and R.M. Williams, among other things.
Australia Post's executive general manager of retail Catriona Noble said the collection would bring "a sense of fun and adventure".
"The Great Aussie Coin Hunt is our most successful collectables program," she said.
"This year we hope it helps to excite Australians about not only collecting each of the unique $1 coins, but also discovering some hidden-gem locations and stories in their very own backyard.
"With many of the 26 coins celebrating destinations across each of our eight states and territories, collectors and adventurers of all ages will be spoilt for choice."
Australia Post has also created an interactive map which features road trips and travel ideas based around this year's series.
For more information about each coin's letter, terms and conditions of the giveaway and the road map, click here