Because, let's face it, this is a forum about a (awesome) PCA and programming, so at least one of those descriptions is going to apply
I don't collect anything, nor have an encyclopaedic knowledge of an obscure area, and I'm not a member of any fan sites, so I don't think I'm a nerd. I don't think I'm a boffin either, as I've not invented anything, and am not involved in any kind of research. So that leaves geek, which seems about right, as most my interests are applying science and technology to my other interests, and I've put the talking model turret from Portal on my birthday wish list.
By these definitions, this does of course mean that the Raspberry Pi team are boffins, so I think they really need to decide who's going to grow the unruly beard, and who gets the (raspberry coloured) elbow patches


