Does such a thing even exist?
I've never heard the term and then in about last three days or so I've seen a couple of dozen posts on various social media feeds such as the following example.
[URL="http://thingssheloves.tumblr.com/post/35787514995/comicsalliance-geek-masculinity-and-the-myth-of"][/URL]

Geek Masculinity and the Myth of the Fake Geek Girl

By Rachel Edidin

I’ve been thinking about fake geek girls—or, more, the tenacity with which the geek community has latched on to the bugbear of the fake geek girl. Even in a community with a reputation as argumentative, the intensity and volume of the vitriol directed at the fake geek girl is unprecedented. It’s flat-out weird.

So, what makes the fake geek girl such a threatening spectre? What, exactly, does she threaten?

Seriously, have I been walking around with my eyes shut or is it just another fanboi elitism?