übernerd; extreme nerd; nerd of nerds
The term nerd is relative. Example: I know a lot about computers and gadgets, so therefore a lot of my friends and relatives consider me a "nerd". But i know how little i actually know, and i myself consult some very wise and nerdy types on certain issues. So if i'm a nerd - what are they? Hence: Nerdiac.
Frink from The Simpsons is a nerdiac.