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1.
1) A form of agreement. Shorthand for "Ok, fair enough".

2) A transient characteristic or nature of coolness, luck and sophistication.
1) Them: "Hey, we should meet at the cinema at 9"
You: "Auif"
Them: "Auif"

2) You: "I'm going to go ask those girls out"
Them: "May the Auif be with you"
by FlibbleJibblet August 01, 2011