Nordic, African, or East Asian countries are not ever thought of as wogs in Australian terminology.
Refering to US Navy enlistee or officer who has never been aboardship as it has crossed the equator. A ceremony (akin to a hazing) takes place where the captain of the ship relinquishes command to "King Poseidan" (Neptune) and the wogs undergo ritualistic torment (usually garbage and food dumped on them) and emerge on the otherside of the equator as Shellbacks... and now seasoned Navy men.
It used to be a racist word a while ago, created for the italians, greeks and maltese when they all came rushing in during the late 60's and most of the 70's.
Now, it's used as a replacement for the word european (the english and french are not considered wog though), it's socialy acceptable these days; can depend how you say it (examples below).
person: oh my gosh shes such a greasy wog! she needs to go back to her own country. wogs these days.
example two; non racist
person1: hey, are you wog?
wog: ahah yeah *continues scoffing pasta down*
person2: ahah your so wog, love it.