A person who doesn't actually do anything at work. But when they talk on the radio, they act like they did everything and then takes all the credit.
A person that is lazy but when they finally do something, they have to announce it over the radio. So everyone can hear what they did.
(Used in any business where the employees talk over a two-way radio.)
Boss: We went ahead and got everything done.
Employee 1: God!, I don't know why he is saying "we". He didn't do anything.
Employee 2: Man, you know he is just a radio-hand.
Employee 1: I know, he just sits in front of his laptop all day watching movies.