Originally posted by royalchickenSeeing as you're in London, have you heard people called 'muppets' or 'mongs' yet?
''Dork'' and the equivalent ''tool'' are both originally slang for ''penis'' although they've now both come to mean someone who makes ill-conceived attempts to be impressive, which usually backfire.
Bear in mind that these are all just the way I've most often heard these words used. One often hears 'nerd' and 'geek' with the opposite definitions to the ones I gave.