2) A term used to describe an overly conspicuous Amateur Radio operator or operators engaged in a qso or walking around at a ham radio swap meet.
3) Any individual that possesses the ultimate geek accessory, an Amateur Radio licence.
See that licence plate and that antenna? He's a radio dude!
Did you hear that radio dude talking about crossdressing last night on the zed zed machine? What an idiot!
He's not a radio dude, he's a fucking CB'er.