You're watching a Liam Neeson movie and make the comment: "Charisma is NOT his dump stat."
When you notice an ability your spouse has (good or bad) you make up a clever name for it, as if it were an attack or a D&D feat.
You've coined the phrase "Marriage Meme" or something to that effect.
Most of your books are very intelligently written SciFi/Fantasy or practical knowledge books.
The ring tones on your phone are mostly video game related.
When you win a fight with an unruly Windows element you hear Mortal Kombat or Final Fantasy Fanfare in your head.
Talking about the viability/specifications of fictional technology doesn't seem strange to you for the first 10 minutes.
You've used more acronyms in a sentence than actual words (this can also apply to military members).
When you blurt out something super nerdy (for example: "That kid has to have a strength of, like, 18!" or "Happy Pi Day!") your friends understand what you mean... well most of them.