Top Definition
An Australian-born woman who is hard as rocks, an absolute bitch and built like a man! (Often has lesbian tendencies and is attracted to other Jillaxes).
* "Get a load of that Jillax...she should be playing for the Bulldogs"

* "Don't worry that your missus dumped you mate...I always thought she was a bit of a Jillax anyway"

* "The worst thing happened last night...I got smashed and ended up hooking into this absolute Jillax...seriously...it was like being with a bloke"
by Loetter December 14, 2010

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