Significat

1. (slang) A person who is intellectual but generally introverted.
2. (informal) One who has an intense, obsessive interest in something.
3. (informal) A member of a subculture revolving around intellectualism, technology, video games, fantasy and science fiction, comic books and assorted media.
4. (informal) One who is socially inept or unattractive, but often brainy; a social outcast.