- A person who swallows live animals, bugs, etc., as a form of entertainment at fairs etc. This often included biting the heads off of chickens. The Geek would usually perform in a "geek pit." This probably comes from the Scottish geck, meaning 'fool', in turn from Low German 19th century
- A derogatory term for one with low social skills, often with high intelligence. Compare nerd. It is theorised that many of these people have Asperger's syndrome. Late 20th century
- A person who is interested in technology, especially computing and new media. Comparable with the classic definition of hacker. Late 20th century and early 21st century (see: geekdom)
- A person with a devotion to something in a way that places him or her outside the mainstream. This could be due to the intensity, depth, or subject of their interest.
Geek has always had negative connotations within society at large, where being described as a geek tends to be an insult. The term has recently become less condescending, or even a badge of honor, within particular fields and subcultures; this is particularly evident in the technical disciplines, where the term is now more of a compliment denoting extraordinary skill.