When I was a kid, I watched every single episode of Doctor Who and kept a notebook about each episode for reference.
I once hosted a Monty Python and the Holy Grail party.
I keep a large towel in my car “just in case”.
I have seen all of the nerd documentaries, Cosmos, Connections, *The Day the Universe Changed, * Nova, etc. etc. etc.
I would leave my husband if Neil deGrasse Tyson even looked in my general direction.
Yep…I’m a nerd!
Okay, I’ll bite. In case of what?
Aliens show up ready to bulldoze the Earth to make way for an intergalactic superhighway.
I memorized all of Tom Lehrer’s song The Elements during study breaks while writing a 15-page term paper on the end-Permian mass extinction.
I own the complete Discworld series, except for Snuff which hasn’t come out in paperback yet.
Ditto for the Dresden Files, excepting Ghost Story.
Ditto for the DVD sets of Avatar: Last Airbender!
During a Kickstarter spree, I bought the entire 7-book set of Order of the Stick- a web comic based on D&D. (And the Deluxe adventure game with expansion set, and a signed art print of all the characters, and the coloring book, stickers, and hit point notepad…)
All the posters in my room are of geologic cross-sections.
Clearly I need to turn in my nerd card. I just can’t measure up.
I feel so… ordinary. 
We are both nerds, and greater nerds than the sum of our parts. 
Prior to marriage, I played D&D from the original to 2nd ed. (Played 3rd ed after, quit for law school.) Also Ravenscroft, Shadowrun, and lots and lots of con games.
I have played every single Might & Magic game from 1 - 10, plus M&M Heros to 6. I have fan stuff for M&M.
I have dreamt in code after coding all day.
I played a Klingon on a Klingon “ship” for a Star Trek fanclub. Including con attendance in character.
I have a kid who plays competitive Pokemon (and rugby and lives in the gym, so there goes your stereotype!)
So the fact that I’m married in no way damages my nerd-cred. 
I’m just a happier nerd now.
That’s the best type of nerd! I’ll go train at the gym then come home and read a book on maths (or string theory or something) before falling asleep.
Paper and dice RPGer for over 30 years,
Computer gamer since the Apple IIe,
First programming was in Fortran on punch-cards,
Was a partner in a play by mail games company,
Was a wholesaler and distributor of games and miniatures,
Early adopter of MtG (stopped after Legends… been “clean” for over 17 years…) 
Has more than a few 40K armies… currently working on an Imp Guard one based on the British 7th Armoured and the LRDG…
I’m prepared to cop to borderline. 
My rooted Android phone has a dice roller set up with all the dice I need for Warhammer Fantasy Roleplay 1st Edition. This doesn’t stop me buying physical dice if I can find a set which complements the character I’m playing - I’m waiting on a set of casino dice for my new Shadowrun character who was raised in Las Vegas.
I wear a waistcoat and tie around 90% of the time.
I wrote about twenty pages of Morrowind fan fiction when I was fifteen.
I used Linux for two years (and in true obnoxious nerd fashion, suggested everybody else use it too).
I can quote Futurama at will, and have watched the episodes with commentary more often than without.
I once was ranked 75th in the world in tiddlywinks.
I’ve played Dwarf Fortress for about six years (I started back when it was 2d), and prefer to use ASCII graphics. I stick with a tileset for Nethack, though.
Previous fancy dress costumes: Pac-Man, HTML code, the concept of 1664.
I am the co-creator of a series of comic strips combining Batman and pre-1066 academia, including history, philology, literature and palaeography. The target audience for this comic is in the double figures, so I’m pretty certain DC won’t be knocking my door down any time soon.
I jury-rigged my iMac to dual-boot Windows about a year before the public release so I could play Monkey Island.
I have degrees in computer-science and math. I read math books for fun (including Euclid) and learn new programming languages just to try them. I’m involved in a couple of open-source projects.
I’m a tea geek; I know what SFTGFOP-1 means. I’m wearing a “Tea Geek” shirt right now.
I’m an adult male but went to the last HP movie premier dressed as Sirius Black.
Perhaps the biggest indication I’m a geek is that I was never into cooking until someone gave me Cooking For Geeks a few years ago and now I cook quite often. I’ve built my own smoker and sous vide setup; I can make a very good duck confit.
I’ve done everything on the Geek chart except write a furry Star Trek fanfic and I have an idea for that.
I first brag to others in guy groups about the nerdiness of Mrs G, as opposed to the usual hot/smart/funny metrics.
She’s told me “You know, you could occasionally objectify my hotness to others…”
Upped my nerd cred quite a bit this week. I spent the 4th of July playing X-Men: Under Siege, the board game. And I was pissed off they didn’t include Colossus.
I read grammar and style guides for fun in my spare time.
I’m not even cool enough to be a doper… I’m more of a doper lurker wannabee…
But I’ve alway noticed when my odometer reaches some symetrical number (like 98789 or 112211)… and point it out to my kids. At some point I realized that soon we would reach 123456. I had the idea to reset the trip odometer precisely at the point to make it read 789.0 at the same time… Cool, huh?? I got a lot of blank looks if I told anyone about this “life goal”
I then photographed the odometer on that fateful day… that photo is one of my most treasured belonging
luv to all
Still a gamer, RPG’s, table top games. Get together with the 'gang’at least twice a month. Created a detailed MS Access database for my nerd collectibles, mostly for comics. I still buy comics.
I’ve shown up for work in my University of Catan alumni shirt.
I’m not gifted in the math department, but I am pretty sure I qualify for all time geek as far as reading. I read the dictionary cover to cover at age 4. Then the Funk and Wagnall complete encyclopedia (back in the dark ages before Wikipedia). I was the only 6 year old in town upset that you could not check out reference books from the library. Spelling bees at county and state level all through school. I still read 300-400 pages a day, and actually feel ill if I don’t have a book in my hand at all times.
Does collecting bugs count as nerdy? Other than that I’ve probably downloaded every tv show in pop culture off the internet and watched them one episode at a time.
I own a computer shop
I am an SCA member, fighter, and Baronial Constable (www.sca.org)
I have about 45 games on my steam account
I refer to the time since stopping WoW as my “Clean and sober period”
I preordered Mechwarrior online
I have an encyclopedic knowledge of the battletech universe and most of its related fiction. Like I can often recite from memory armor and weapon loadouts for obscure variants of inner sphere mechs and all standard loadouts of clan mechs.
I got netflix just so I could over the process of about 6 months watch every episode of Buffy the Vampire slayer, angel , Star trek voyager, star trek: deep space nine, and Enterprise. Currently working my way through X-files.