Green’s Dictionary of Slang

1. clumsy, uncoordinated.

2001		(con. 1964–8) J. Ellroy Cold Six Thousand 54: His hands moved mile-a-minute. He made geek semaphore.
2007		N. ‘Razor’ Smith Raiders 9: The spotty geek driver, the dumpling box-carrier, the near-empty street.

2. pertaining to the world of obsessives, esp. in the context of computing, the Internet etc.

1989		D. Waters Heathers [film script] Fuck me gently with a chainsaw. Do I look like Mother Theresa? If I did, I probably wouldn’t mind talking to the geek squad.
2000		Wash. Post 23 Jan. X10: At Wired, we write geek and we write street. We insist on accuracy and literacy, but we celebrate the colloquial.
2005		rev. of L. Theroux’s ‘Call of the Weird’ in Observer 20 Nov. 🌐 All-American weirdness was Louis’s journalistic turf and [...] reportage that was more geek than gonzo.