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1.
a slang term used as a substitute for good day. This term is the greatest word ever invented by Australians!
G'day mate, hows it goin? Wanna hit up the pub tonite and drink another keg?
by twangos flaming budds July 21, 2003
 
2.
derived from the words 'good' and 'day', gday is an australian word used to greet ones mate buddy or cobber.
person 1: gday mate, how goes it true blue fair dinkum aussie bloke?
person 2: it goes great cobber, hows yourself?
person 1: well my missus has been mad at me because i stayed at the pub too long drinking emu export
person 2: dont worry buddy, come around to my place later and we can watch the footy and drink booze
person 1: your a true mate cob, fair dinkum
by Jem January 04, 2005
 
3.
The Australian informal greeting/my favorite word
G day M8 how ya goin
by S i m m o July 18, 2006
 
4.
ausie contraction for good day, same as hello or sup, greeting
G'day mate!
by Big White November 11, 2003
 
5.
(Aus.) Possibly shortened form of 'good day', but can be used in place of 'hello' or 'hi'.
"G'day, mate!"
by Mad Walrus August 06, 2002
 
6.
Literally means "Good Day", a common Australian informal greeting.
G day Chris, whats crackin?
by Goyds October 24, 2007
 
7.
aussie slnag for saying hi
person1: gday mate how r u?
person2: im good mate
by bushy911 February 20, 2007