| ocker (n) | an unsophisticated person, a laid-back character, uncouth Aussie male |
| ockie strap (n) | bungee cord From "octopus." |
| off one's face (adj) | describing one who is drunk |
| off with the fairies (adj) | describing one who is a bit loony |
| offsider (n) | sidekick, assistant, helper |
| Oi! | "Hey!" |
| oil (adj) | information "Give the oil on that project." |
| old fella (n) | penis |
| oldies, olds (n) | adults, parents, seniors "Let's ask the olds if they know." |
| omelette (n) (Chinese restaurant) |
egg foo yung |
| on a good lurk (adj) | on a good job |
| ono (adj) | abbreviation in classified ad for or near offer Used the same as "obo" ("or best offer") in U.S. |
| on the back foot (adj) | on the defensive |
| on the bones of his bum (adj) | destitute, broke |
| on the mend (adj) | getting better |
| on the nose (adj) | bad-smelling, stinky "Your dog's a bit on the nose." |
| on the turps (adj) | drunk |
| on your bike (v) (pronounced onyerbike) |
get out of here, go away, get going |
| onya | short for "good on you," i.e., "well done" commonly used as a congratulation |
| op shop (n) | thrift store opportunity shop |
| open slather (adj) | a situation where there are no limits or constraints on behavior. "Liberalizing liquor store hours would give open slather to public drunkenness." |
| oregon, oregon pine (n) | light American pine wood used in furniture, panelling technically referring to Douglas Fir, grown as a crop in Australia |
| O.S. (adj) | overseas "Les is O.S." |
| outback (n) | distant Australian bushland |
| outcome (n) (adj) | results |
| outgoings (adj) | expenditures |
| oval (n) | athletic field or stadium |
| over east (adj) | the east coast of Australia |
| overtime loadings (n) | overtime pay |
| oysters (motion pictures) | to shoot in available (or natural) light From "oysters natural" |
| Oz (n) | Australia |