1 n someone who’s a little bit too knowledgeable about one subject. Generally a subject like seventeenth-century flower pots or steam trains, rather than athletic sexual positions or gun-fighting. Americans (and also Brits, as our languages merge ever closer) would call such a person a “geek.” It may originate with the fans of Radio Caroline, a U.K. offshore pirate radio station, whose fans had to don anoraks in order to visit the station. Alternatively, it may come from the most popular item of clothing worn by train-spotters. 2 n waterproof jacket (universal).