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A

Arvo: Short for afternoon.
Aussie salute: Brushing away flies with the hand.

B

Bail out: Depart, usually angrily.
Bail (somebody) up: To corner somebody physically.
Balls-up: Mistake.
Barbie: Barbecue (noun).
Barney: A fight.
Barrack: To cheer on (football team, etc.).
Battler: Someone working hard and just barely making a living.
Beaut, beauty: Great, fantastic.
Bib and tucker: Best clothing. When you're in your bib and tucker you're "dressed to the nines."
Big-note oneself: Brag, boast.
Bikkie: Biscuit (also "it cost big bikkies" — it was expensive).
Billabong: An oxbow river or watering hole.
Billy: Large tin can used to boil water over a campfire for tea.
Bities: Biting insects.
Bitzer: Mongrel dog (bits of this and bits of that).
Bizzo: Business. ("Mind your own bizzo.")
Black stump, beyond the: A long way away, the back of nowhere.
Bloke: Man, guy.
Bloody: Very (bloody hard yakka).
Bloody oath!: That's certainly true.
Blow-in: Unexpected visitor.
Blow-through: Leaving with a goodbye.
Blowie: Blowfly.
Bludger: Lazy person, layabout, somebody who always relies on other people to do things or lend him things.
Blue: Fight. ("He was having a blue with his wife.")
Blue, make a: Make a mistake.
Bluey: Pack, equipment, traffic ticket, redhead.
Bluey: Blue heeler cattle dog (named after its subtle markings), which is an excellent working dog. Everyone's favorite all-Aussie dog.
Bob's your uncle: When someone explains something that has a logical conclusion, they may end with that phrase. It means they expect you to easily follow the progression and things will work out.
Bodgy: Of inferior quality.
Bog in: Commence eating, to attack food with enthusiasm.
Bollocky: To be in the "bollocky" is to be naked.
Bonzer: Great, ripper.
Boofhead: A dill, or idiot.
Boomer: A large male kangaroo.
Boozer: A pub.
Bottle-o: Liquor shop.
Bottler: Something excellent.
Bottling, his blood's worth: He's an excellent, helpful bloke.
Bourke Street, he doesn't know Christmas from: He's a bit slow in the head. (Bourke Street is a brightly lit Melbourne street.)
Brasco: Toilet.
Brass razoo, he hasn't got a: He's very poor.
Brown-eyed mullet: A turd in the sea (where you're swimming!).
Brumby: A wild horse.
Bull bar: Stout bar fixed to the front of a vehicle to protect against hitting kangaroos.
Bugger off, go to buggery: Get lost.
Bung it on: To pretend, or lay it on thick. Pretentious.
Bushranger: Highwayman, outlaw.
Bush telly: Campfire.