"No worries" - not really slang, but common enough use...
cordial - like kool-aid for our north american friends
to let something "go through to the keeper" - from the game of Cricket - to let somethine lie(usually in a conversation, perhaps something a bit risque or embarasshing: "I'll let that go through to the keeper!")
digger - a common bloke(man)- usually a mate in the pub - "How are ya, ya old digger?"
larrakin - a bit of a lout/fool.. someone who likes to muck around.. usually harmless fun
little johnnie - a [unmentionable]
Some Rhyming Slang:
Frog & Toad - Road
Dog & Bone - 'phone
Trouble & Strife - wife
------------------
UA 1K MEL