geeky
adj.adj. having a lot of knowledge about a specific subject, often one that is not very popular with most people. It can also describe someone who is very interested in things like computers, science, or old movies.
adj. possessing a high level of knowledge or intense interest in a specific subject, often one that is considered niche or obscure. Frequently used to describe a person's personality or a specific interest in technology and pop culture.
He has a very geeky interest in old video games.
The conference was full of geeky fans who spent the whole weekend discussing the latest science fiction novels.
While some view his geeky obsession with vintage hardware as a hobby, others see it as a legitimate contribution to the preservation of early computing history.
From geek + -y.