noun. A female geek. Also: geektress.
Real citation: "Hello all! This is Wyrdsister, Raevyn's friend and local computer geekstress. She's asked me to make a little post for her here just updating things."
(Wyrdsister, Nov. 16, 2004, A Raevyn's Tale, http://raevyndaughter.orangeblogs.ca/archives/
Made-up citation: "If I ever have a daughter, she will probably be a geekstress, and she will definitely be armed to the teeth."