Hundreds of years ago, the term geek wasn't as benign as it is today (high fives all around, gang). In 18th-century Austria-Hungary it was synonymous with freak--literally, used as the word for circus performers. Now, at worst, it's used to describe someone who's maybe a little too into comic books or tech.
Flowtown breaks down the evolution of the word geek over time in this infographic. See the fall of the Ubergeek Steve Urkel and the kaleidoscopic fracturing of the pop culture geek.
But could some of these things actually be nerdy?
I do not see my own image, lol.
In between "Gecken" and "Geekus Prime" are all SORTS of geeks who have been left out. There were the Ham Radio Geeks from the WWII era (still with us today - the guys with the KN075 license plates). There were the Audio/Visual Club Geeks from the '50's and '60's, the guys who spliced broken filmstrips and 8mm movies in class, or got the slide projector working. There were Slipstick Geeks wielding slide rules, and the whole 19th Century is full of Clockwork Geeks and Mathematics Geeks and even Steam Engine Geeks! What was Einstein, if not a died-in-the-wool Physics Geek of the first order? He deliberately got a low-demand civil service job so he could engage in his Geek Hobby while at work!
The evolution of geeks is MUCH more extensive than this diagram describes. Get back to work, Graphic Design Geeks!
"The Good and Great Must Ever Shun,
That Reckless and Abandoned One
Who Stoops to Perpetrate a Pun"
Lewis Carroll, 'The Three Voices.'