Little Yellow Canary

G

G'Day : hello!
Gabba : Wooloongabba - the Brisbane cricket ground
Galah : fool, silly person. Named after the bird of the same name because of its antics and the noise it makes.
Garbo, garbologist : municipal garbage collector
Give it a burl : try it, have a go
Gobful, give a : to abuse, usually justifiably ("The neighbours were having a noisy party so I went and gave them a gobful")
Gobsmacked : surprised, astounded
Going off : used of a night spot or party that is a lot of fun - "the place was really going off"
Good oil : useful information, a good idea, the truth
Good onya : good for you, well done
Goog, as full as a : drunk. "Goog" is a variation of the northern English slangword "goggie" meaning an egg.
Greenie : environmentalist
Grinning like a shot fox : very happy, smugly satisfied
Grog : liquor, beer ("bring your own grog, you bludger")
Grouse (adj.) : great, terrific, very good
Grundies : undies, underwear (from Reg Grundy, a television person)
Gutful of piss : drunk, "he's got a gutful of piss"
Gyno : gynaecologist

H

Handle : beer glass with a handle
Heaps : a lot, e.g. "thanks heaps", "(s)he earned heaps of money" etc.
Holy dooley! : an exclamation of surprise = "Good heavens!", "My goodness!" "Good grief!" or similar
Hoon : hooligan
Hooroo : goodbye
Hotel : often just a pub
Hottie : hot water bottle

I

Icy pole, ice block : popsicle, lollypop

J

Jackaroo : a male station hand (a station is a big farm/grazing property)
Jillaroo : a female station hand
Joey : baby kangaroo
Journo : journalist
Jug : electric kettle
Jumbuck : sheep

K

Kangaroos loose in the top paddock : Intellectually inadequate ("he's got kangaroos loose in the top paddock")
Kelpie : Australian sheepdog originally bred from Scottish collie
Kero : kerosene
Kindie : kindergarten
Knock : to criticise
Knock back : refusal (noun), refuse (transitive verb)
Knocker : somebody who criticises