Green’s Dictionary of Slang

1. anyone outside a peer group who thus fails to fit in with ‘the gang’, esp. a studious individual who eschews drink, drugs and similar teen pleasures.

1988		graffito q. in Thorne Dict. Contemp Sl. (1990) 10: An anorak is one of those boring gits who sits at the front of every lecture with pringle jumpers asking the lecturer clever questions.
1999		Indep. Rev. 18 June 16: Fridge are a bunch of anoraks.

2. an obsessive, typically as regards computing (in an earlier age his interest would have been trainspotting).

1984		Observer 5 Aug. 5/3: At weekends boatloads of Dutch ‘anoraks’ – pirate radio fans – come out to cheer on their latest hero.
1998		Guardian Sport 18 Sept. 16: Seven anoraks, three care-in-the-communities plus a geezer who misread the notice.
2000		Indep. Rev. 15 Jan. 20: ‘Definitely anorakish.’ Well, if I’m a bit of an anorak, so was the last poet laureate but one.
2005		L. Theroux Call of the Weird (2006) 169: In its anorak quality, its hobbyism, the event felt oddly English.
2010		Eve. Standard 29 Nov. 17/2: Good news for political anoraks.
2021		L. McInerney Rules of Revelation 323: [of local history fans] She asked the anoraks where they were off to next and took three of the five with her.