geek

/ɡiːk/

A carnival performer specializing in bizarre and unappetizing behavior.

I once saw a geek bite the head off a live chicken.

A person who is intensely interested in a particular field or hobby and often having limited or nonstandard social skills. Often used with an attributive noun.

I was a complete computer geek in high school, but I get out a lot more now.

(by extension) An expert in a technical field, particularly one having to do with computers.

Do you need a hardware geek or a software geek?

The subculture of geeks; an esoteric subject of interest that is marginal to the social mainstream; the philosophy, events, and physical artifacts of geeks; geekness.

An unfashionable or socially undesirable person.

Why do you hang around with them? They’re just geeks.