trackie-daks are the bottom half of the tracksuit, not the whole. the whole tracksuit is the trackie; the pants are the trackie-daks. but Random's example is unsurpassable :)

A tracksuit. This term is very commonly used in Australia.

Australian. Trousers, usually a bit more formal than jeans. Hence underdaks and trackie-daks

a group of hillbillys riding bicycles together. derigor clothing for this peleton are a beanie, clothing advertising football or beer,trackie dacks, an unkempt long goatee is compulsory for males (but optional for females)as is the cigarette for both genders. bikes must not be worth more than a slab (of beer aka carton) extra style points awarded for bikes from the tip or from dubious legal origins (stolen)

An Australian slang term.
A dag is technically the matted wool on a sheeps tail, but in typical useage throughout Australia, it refers to people who don't have a neat, tidy or cultured appearance. It can also refer to a person who tends to be quite informal.
It is not necessarily a derogatory term in modern useage.

Australian slang for an RSL - a Returned Soldiers League club. this is a place where people meet for cheap meals, drinks, entertainment, and to (unfortunately) play the Pokies. also known as an Ari.

in Australian slang, nong is used as a pretty mild and/or endearing insult. a bit of a twit, or idiot. nothing too mean or horrid is meant by calling someone a nong.