Discussing nerdy topics just after engaging in them with the person(s) one engaged in them with, for example discussing a sci-fi movie one has just watched or a game or Warhammer 40K one has just played.
Just like regular people cuddle after sex, nerds (who traditionally don't have sex) discuss after their equalent of sex (games and sci-fi).
Nerd 1: "That sure was an exciting game of Warhammer! Do you wish to nerdcuddle now?"
Nerd 2: "Dude I told you to stop calling it that..."