Anorak (slang)
From Wikipedia, the free encyclopedia
In British slang an anorak (pronounced /ˈænəræk/) is a person who has a very strong interest, perhaps obsessive, in niche subjects. This interest may be unacknowledged or not understood by the general public. The best known explanation of the term is the use of anoraks (a type of rain jacket) by train spotters, a prototype group for interest in detailed trivia.
Although the term is often used synonymously with geek, the Japanese term otaku or the American term "fanboy" are probably closer synonyms.
Origin
One explanation is that the usage derives from the weatherproof outer clothing worn by enthusiasts of offshore radio, who would sometimes visit the ships from which their 'outcast heroes' broadcast during the 1964–76 period. The term was, reportedly, coined by Andy Archer, a disc jockey of the time – presumably as the appearance of these enthusiasts made a collective impression – and later became generalized to mean an obsessive enthusiast of other activities. Another origin may well be the groups of train-spotters throughout the UK who often wore anoraks when train-spotting in the cold.
Explanation courtesy of Wikepedia - normally the font of all incorrect knowledge, but perfectly explained above
I have to say that I wish there was another approriate expression, because wearing a heavy padded anorak here in Tobago is really getting me down. I must have sweated (???) off 2 stone in weight (please don't make me explain that as well
) since we got here at the start of February.
The best advice I got on this trip was given on the first day I arrived. It was "slow down, your walking too fast" and that set the mood for the rest of my time in Tobago. 
. I find that a beastly cold Carib helps after each walk 
. 
