This refers to those individuals who never leave their cubicles at work. They never go into a plant, a factory, or the field ; they seldom leave their 4' by 4' space to lunch with fellow humans...(you get it). As soon as you read this someone you know came to mind...
I think you will have agree that old "B__" has carpet-feet these days, he cant seem to move from his desk anymore. Almost like his butt was glued to his chair...