Nanomanagement is an extremely poor type of management where the manger not only overmanages their employees' work, but all of the employees' other tasks on a daily basis. This includes but is not limited to delegaing meaningless tasks like copy and pasting information, asking employees to send an email for them, etc.

Instead of giving employees general instructions, room to use their imagination and empowering them, a nanomanager not only assesses every step, but also assigns and manages each little task for each step.

This type of management may be motivated by but not limited to the manager's concern for details, the manager not having any work of their own to do, feeling insecure about their position as manager and having the need to demonstrate their power to their employees.

The effect of nanomanagement will be de-motivated employees, lowered morale, increased resentment and low retention

when you've done something so cringe you can't stop replaying it in your head and it stops you from getting on with your every day life

Even more stunningly annoying and inappropriately intrusive than micromanagement.