Opposite of "Can Do" people. All of those most annoying people you work with who portray themselves as MVP's of the company when in fact the don't actually make anything happen. They just say they do. Oddly this affects most people in Marketing and Sales.
"Oh man. Gary keeps pubulishing to-do lists for everyone else in the office instead of actually doing anything constructive."
"I know. The dude's a real "Can Don't".