Definition from Wiktionary, the free dictionary
bikie (plural bikies)
- (slang, Australia) A motorcyclist who is a member of a gang; a biker.
- 2008 February 19, Dylan Welch, Sydney Morning Herald,
- A luxury waterfront flat believed to be owned by a Hells Angels bikie in Sydney was searched by police this afternoon.
The term is popularly used of gang members by others; the members themselves prefer the more neutral term biker.