On orkut.com’s Geeks community, Joel said:

You’re right. Geekiness is the state of wanting to know and
understand everything. True Geeks can geek on any topic, after very
little preparation.

Example: My degree is Chemistry, I work in computers, and I do
theater tech/SF conventions/other cons/etc. on the side. My GF is a
mechanincal engineer (and just as much a geek). I make her crazy
sometimes because just talking about what she does at work I’ll pick
up enough about stuff (that she has a degree in and I don’t) to make
informed suggestions as to how to fix problems they’re having.

This goes hand-in-hand with the state of “Being an Engineer”. PEs
will make you believe that it involves much training, experience,
and certification. I claim that it is a state of mind, encompassing
a certain level of geekiness, and a whole lot of logical problems
solving.