Similar to street cred, but applicable to geeks. Geek cred is allocated by displaying knowledge of different aspects of geek culture such as Star Wars, anime, comic books, etc.
1."The new guy at work complimented me on my InuYasha t-shirt. And then we had a discussion about which fo the movies was the best. Major geek cred on both our parts."
2."You have the un-edited original trilogy ripped from the laser discs? That's like, plus 10 geek cred"