Susan,

'anorak' - (noun, eym.dub, slang): A derogatory word used to describe people who relate better to bits and bytes than to people. An English term coined when such folk would be seen at sci-fi conventions, railway meets and other such gatherings of pustulent, post-pubescent single white males. Thus called because for years they were the only people who wore anoraks (the nylon, hooded jackets that have recently become fashionable again - so the real anoraks have given up wearing them in favour of Army surplus gear).
Akin to trainspotters, nerds, Trekkies, dweebs and other social misfits ;-)

It's a term that could never be applied to any 'Catter, of course!