Berk, I learned relatively recently, is not quite as innocent as one might assume. I'd used it since primary school myself without ever encountering serious objection, but it's taken from rhyming slang - that is, it's a diminution of Berkshire Hunt...
*Cough*
really? I never knrw that. You learn something nrw every day! I wonder how many english people are aware of that? As someone like James who grew up using that word i am shoxked. And a little titilated by the amount of times i have used that word! Lol