That is not at all the definition of geek I subscribe to. I think a geek is much like a hacker, but is a more general term. It describes a group of people who are skilled and interested in a particular area. This area is usually computers, but like nerd, the work can be used with other areas. For example an astronomy geek, someone with a passion and sigificant skills and interest in the area of astronomy.

Here is a supporting argument, which maybe is not quite what I mean when I think of geek, but is closer than the dictionary meaning you quoted.

There a several more definitions on everything2 if you search for geek, but here is one quote I mostly agree with.

>  While a normal only wants to use a thing, a geek strives 
>  to understand that thing.

However just about every hacker/geek/nerd has a different idea of what those words mean, and every one of those meanings in right :)
Of course the general public, which gets those definitions only from hollywood or dictionaries have no clue what they are talking about. :)