Just what is an Anorak?

In case you were wondering just what the heck an anorak is, let alone a tri-anorak, here's what the wikiperdia says:

In British slang, anorak has come to mean "geek" or "nerd", originally from their use as the invariable wear of train spotters, and then by extension to refer to anyone with an unfathomable interest in detailed information regarded as boring by the rest of the population - aided by the intuition that only a geek would wear something so terminally unfashionable.