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1.
A reference to eating a large amount of the free food offered at restaurants. First coined from the awesome bread 'The Outback Steakhouse' offers but can also apply to the cheese biscuits at 'The Red Lobster' or salsa at any mexican restaurant. Can also be used in the sense of 'pulling an outback.'
Here comes the bread - time to go Outbacking!
by jive sukka April 23, 2007
 
2.
Going into the wilderness to explore for any length of time.
I was having a nice day of outbacking this one time with my friend. We were just getting over a big rock when, through some bushes, we saw a couple of kangaroos having a root.
by Kayama57 December 27, 2012