geek

1. A carnival performer specializing in bizarre and unappetizing behavior.

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

2. 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.

3. (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?

4. 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.
5. An unfashionable or socially undesirable person.

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

1. To behave geekishly or in a socially awkward manner, especially when under the influence of drugs or other psycho-active substances, and exhibiting such marked characteristics as hyperactivity, repetitiveness, talkativeness, nervousness, irritability, or paranoia.

   Hey, check out that guy...he's really geeking out pretty bad.

1. A look.

   Have a geek at this.

verb

To look; to peep; to stare about intently.