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G

Galah: Fool, named after the bird of the same name that flies south in the winter — a bloody silly thing to do in the Southern Hemisphere.
Garbo, garbologist: Municipal garbage collector.
G'day: Hello!
Give it a burl: Try it, have a go.
Gobful, give a: To abuse, usually justifiably. ("The neighbors were having a noisy party so I went and gave them a gobful.")
Going off: 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 slang word "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: Great, terrific, very good.

H

Handle: Beer glass with a handle.
Hoon: Hooligan.
Hooroo: Goodbye.
Hotel: Often just a pub.
Hottie: Hot-water bottle.

I

Icy pole, ice block: Popsicle, lollipop.

J

Jackaroo: A male station hand (a station is a big farm/ranch).
Jillaroo: A female station hand.
Joey: Baby kangaroo.
Journo: Journalist.
Jumbuck: Sheep.