O.S. : overseas ("he's gone O.S.")
Ocker : an unsophisticated aussie person
Offsider : an able assistant, a helper
Off your tucker : not eating; lost one's appetite
Old chook : a silly old woman
Old country : England
Old crackers : elderly people; especially said of one's parents or in-laws
Old man : a person's father
Old fella : a male penis
Oldies : parents - "I'll have to get my oldies permission"
On the blink : not working
On the turps : somebody who drinks heavily
Op shop : opportunity shop, a thrift store, a store which sells second hand goods
Outback : interior of Australia
Outstation : an outlying sheep or cattle station
Ow ya' goin'? : How are you going?
Oz : the entire country of Australia
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