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An attractive girl who intentionally develops an interest in traditionally geeky activities such as tabletop RPGs, strategy games, Star Trek, MANGA or LARP. In the case of a geek betty this is often done in order to create common interests with the geeky boys who interest her.
"Dude, Nigel! Why is Michelle always crashing our weekly AD&D game? I mean she doesn't even know what a saving throw is!"

"Well, Mervin, I suspect it's not about the game. I wouldn't be surprised if she were joining our group because she's physically attracted to you and is expressing interest in your hobby in order to get close to you."

"No way! Who would have thought Michelle was a geek betty?"
by ThisFuzzyGuy July 07, 2013
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