It's a hierarchy. You have a department, or other such division, with a manager to coordinate it. Then you have a manager who manages all the departments, or a subsection thereof, to coordinate them; this is "managing managers" and typically more complex due to the interdisciplinary nature. Then you have managers to manage the manager-managers, who oversee entire regions or similar sectors.

Sometimes manager-manager managers are necessary, but if you need managers to micromanage manager-managers, your organization has problems