A particularly ditzy or dim-witted female who is prone to making stupid or ignorant mistakes.
Ron: "So I met this pretty hot chick last night, she said her name was Cindy, lives on campus apparently. Only problem is, she's not too smart."
Jeremy: "Yeah, Cindy that lives in Seth North. Dude, she once told Jeff that she was excited for Global Warming because it would help her tan."
Ron: "Really? Wow."
Jeremy: "Yeah, dude, she's a total Sarah Failin."