Australian slang which is a mixture of the Australian slang of 'wog' and 'bogan'.
A 'wogan' is a wog that has migrated from Europe to Australia, assimilated so well that they have rejected the style and class usually identified with Europe and veered towards becoming a bogan. They have absolutely no fashion sense; a day out involves going to the Rugby League, drinking copious amountes of alcohol, being loud and obnoxious and spending time working on their hotted up cars listening to Jimmy Barnes.
Look at her, she is a disgrace to wogs. Her parents had so much class when they migrated to Australia but she has become a wogan.