Magic!!! 
I vote for nerdy pick-up lines.
“I must have failed my saving throw, because you just charmed me!” (See http://www.suescomic.reallyrules.com/comic33.html)
Although the card came Munchkin comes a close second.
Shoot, I mean *game. * 
Umm, the OP asked for things aside from RPGing - Dungeons&Dragons is an RPG. That and I did mention it in my explanation of what RPG stands for in a previous post.
At least you didn’t mention The Rocky Horror Picture Show
See, that’s the first thing that came to mind for me as well - until I remembered all the T&A, same-sex gropage, and general not-geekness in the room of every DopeFest I’ve ever been to. Well, excluding our wedding 'Fest - our MOMS were there!
Can you give us a little more context? I think people’s connotations of geek differ, for instance, ‘furry’ doesn’t say ‘geek’ to me at all.
Depending on what you’re aiming at you might choose between:
Nitpicking startrek
Planning a party and totally missing the fun part
Doing maths/physics/programming
Using some geek terminology innapropriately ()
Telling geeky jokes
Playing Madden 2004 does not make you geeky, it makes you a sports fan. Playing The Sims does not make you geeky, it makes you a middle-aged mom from Nebraska. (Someone mentioned The Sims in another geeky thread.) I talked to these people all day long when I worked at EA. Now, creating your own teams and playing hours and hours and hours of career mode, or creating your own skins, meshes, and tilesets to reenact your favorite fictional setting that makes you geeky.
Every Friday night, man! Elbow sex! Elbow sex! Again, do what you love to do… who cares if you’re a geek or not? The geekier the better, I say!! HUZZAH! Oh, Rocky! Live long and prosper. May the force be with you!
Just because you don’t understand, doesn’t mean it’s to be insulted, feared, run away screaming from, or whatnot.
Though I had a “frightening” moment waiting for my pals to arrive at the re-release of The Empire Strikes Back at the Cine’ Capri one weekend a few years back. This very large fellow in a pea-green bathrobe turned homemade Jedi Counsel costume saw me, a solitary and attractive female, standing near the doors of the theater (theatre? ha ha! I know the difference!) and so decided to rescue the damsel not in distress (I was distressed after he came over to me).
He asked me if I needed anything. Need? Um yeah, I need my boyfriend to arrive… like NOW. I shook my head and smiled politely (wrong move). He hovered close as if he was playing protector to some helpless maiden and proceeded to tell me his name and rank in some imaginary Jedi Counsel (group of his friends who met in the backyard every other weekend for serious debate=geektalk for “Who’d win this fight… X or Y?” and discussions on the logistics of making a real Death Star). :rolleyes:
OK, I am creeped out at this point. When a guy justs offers this kind of revealing smalltalk, back away very slowly (hee hee). No, I wasn’t really upset by his hobbies, I just didn’t want to be scented down by every single, lonely geek male in the area because I was without escort. Fresh meat! No thank you.
All of these hobbies and interests, IMHO, make you who you are and it’s cool. I loved watching “Xena” when it was on and I’m considering buying the videos when I get the spare cash. It’s ALL GOOD, people! Be whomever you are.
Board games, preferably wargames, preferably very complicated ones.
How about geocaching?
I find it interesting how many of these activities begin with the words “sitting around…”
So with that in mind:
Sitting around with a group of people recalling Monty Python and the Holy Grail line by line, word for word. There have to be arguments not just about phrasing, which must be precise, but also about timing, such as the exact length of the pause before Cleese says, “…Tim.”
Is considering whether an activity is geeky, in itself inherently more geeky than it? If so, this thread, and then this post, are paradigm shifts in geekiness.
And if I then considered that this concept could be extended indefinately, we’d end up with some w-geekiness, merely by making that observation.
Can we go beyond that?
Odyssey of the Mind
Hey… wait a sec! I like watching Monty Python (movies included) and have been known to quote a line or two. Like OpalCat says, “Day-am!”. I must be the geekiest girl on the planet! D&D, RHPS, Star Wars, Star Trek, MP, SNL, KITH, Xena, Highlander, GS, comics, LOTR… you name it, I probably enjoy it (even to a lesser degree).
I don’t mind being a geek but then again, I enjoy being perverse and strange. Well, except for geocaching… that I just don’t get. scratches under her Xena wig in confusion
Any activity that includes the use of the word “w-geekiness” would qualify IMHO.
I thought it was unclear if an activity involving w-geekiness would be (w+1)-geekiness or (1+w) geekiness. OK, that counts.
Sitting around, arguing who would win a fight between Captain America and Batman.
Particularly when discussion opens about Known Tricks Captain America Has Done With His Shield vs. Known Items Batman Carries In His Utility Belt At Any Given Time.
Okay, so not technically RPGing:
Holding a 21st “birthday” party for your RPG Campaign… (yes, it’s been running that long)… a costume party mind… come as one of your characters…
And of course the campaign itself is based on DragonQuest, a game that’s been out of print for 20-odd years. (We don’t count 3rd edition) 
Debating trivial comic details would qualify as (w+1)-geekiness. Debating the usage of w-geekiness would be closer to (w+w)-geekiness.
Does this make me a (w+w)geek?
Cervaise wins.