I don't know. The pantheon of potential geeky interests is so large, I doubt I could ever be sufficiently immersed in all their facets to be a geek to all of them.
I knew who winter soldier was and so forth, but I've never read Watchmen. (I'm used to the look of modern comic art, and the old stuff grates).
I can name lots of cards and their abilities from an obscure CCG called Anachronism, but I've never tried Magic or Pokémon. (I can name three)
I've played several pen and paper RPGs, but only DnD 3.5 and after. None of the advanced. I don't know THACO.
Nah, Geek is a word that has lost all meaning. the fandoms are too many and too large.