1 a waterproof jacket, usually with a hood.
2 Brit. informal a socially inept person with an obsessive interest in something.
— ORIGIN Greenland Eskimo
• noun Brit.
1 a person who collects locomotive numbers as a hobby.
2 (often derogatory) a person who obsessively studies the minutiae of any minority
interest or specialized hobby.
— DERIVATIVES trainspotting noun
An anorak is often a socially inept person (but usually intelligent and particularly anally retentive person) having an obsessive interest in a hobby or subject. Usually he has little or no fashion sense, and errs towards eccentricity. The slang usage originates from the 'trainspotter' look, of wearing anoraks; spending so much time at the end of station platforms in all weathers necessitates the wearing of such attire.
Trainspotting for the uninitiated is the much ridiculed hobby of rail enthusiasts viewing and taking note of trains from station platforms. Slang-wise the expression was popular on the club scene at which a trainspotter will be seen watching DJ's, spotting which tracks are played and gleaning knowledge on the music for future reference
Typical usage: Shaun in the IT department is such an anorak/trainspotter about servers