I thought being called a geek meant you liked something so much that you were willing to forgo social outings and popularity. That still seems to be the case, but the once coveted term is now being used as a marketing gimmick, and those who truly deserve the label are lost in the noise.
Pretentious females who have labeled themselves as a "geek girl" figured out that guys will pay a lot of attention to them if they proclaim they are reading comics or playing video games. Celebrities are dressing up as geeks to reach a larger audience. Richard Branson labeled himself a geek for crying out loud.
If you are otaku-obsessed about something, keep doing what you love and share with others that have the same passionate interest as you. And if you think something is interesting but aren't willing to put the time and effort into understanding it deeply or becoming extremely skillful at it, do everyone a favor and call yourself what you are: a casual hobbyist.
Being really passionate or skillful at something is not something you can fake; it takes a lot of hard work to be a geek. Being a geek isn't something you so much decide to do, but realize you are after the fact. People who are obsessed with something often don't even know it until others point it out to them, they are just doing what they like without thinking about the how or why.
Those that are deceitful about being a geek do it because deep down they want to feel that hunger to be so into something you can't eat or sleep, but just haven't found their thing yet. Don't pretend to love something because you think it will get you attention. Don't think that you can take a shortcut because there isn't one. Dig deep, dig to the roots, dig until you know things that others you admire in the subject matter don't know or can't do. Then go ahead and proudly label yourself a geeky girl.
This one too: Dear Fake Geek Girls: Please Go Away