Novelty Nerd
An individual who goes beyond normal means to be portrayed as a nerd for the social acceptance/"cool factor" while having no actual "nerd" characteristics. Said person will dress like a nerd (faux glasses, 80's apparel, etc...) and throw out the occasional Star Wars or Star Trek reference, but has probably only seen one move/episode.
I asked Joe to fix my laptop, but it turns out he's just a novelty nerd and doesn't really know anything about computers.