The word 'geek' can be a positive or negative term depending on who's using it and why, but basically geekery is a subculture. Geeks are unusual in that they are extremely enthusiastic about something that mainstream culture suggests isn't 'cool' or a worthwhile pursuit. Their ability to immerse themselves in a subject that most people consider inconsequential or silly and take it completely seriously is what makes them a geek. You can be geeky about almost anything, but the usual areas you see this in are popular culture and technology (although techno-geeks often evolve into nerds due to the amount of time this pursuit demands from them. Let me explain...)
A long time ago, in a galaxy far, far away... the tyrannical Empire has most of the planets in the galaxy under it's control. A small group of under-resourced rebels are battling to end this reign of fear and dictatorship while the Empire attempts to wipe them out in return. In particular we focus on three of them; Princess Leia Organa, whose family has a long involvement in the Rebellion, Han Solo, a mercenary who gets involved by accident, and Luke Skywalker, an eager and talented young pilot from a backwater planet. 
