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an Aussie abbreviation for "Are you sure you don't?". Usually only used by people with a university degree and later stolen by extremely good looking people.
good looking person 1 '' do you want a beer?''
good looking person 2 '"no thanks mate"
good looking person 1 "sure not?"

or

Lawyer "want a piece of cake?"
good looking person "no it will ruin my good looks"
lawyer "sure not?"
good looking person "your not a good looking person"
lawyer "no but I'm a lawyer"
good looking person "oh ok"

Note:
Can also answer the question "Sure not?" by reversing the question, making the answer "Not Sure"
by Walking In my Dreams October 11, 2016
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