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A woman who shows interest in sleeping with you without any input by you whatsoever.

After you do a woman a favor and she "owes you one"

A slutty ex-girlfriend who will do you anytime anywhere
After you help a woman jumpstart her car, she's a surebang.

The cashier at the grocery store that always hits on you, she's a surebang.

"Man, she was hitting on you, she's a surebang."

Tim "I can't hook up with anyone"

Chuck "Call Ashley, she's a surebang"
by Thad Neal September 28, 2006
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