eyes in the back of (one's) head
The ability to detect what is going on all around one, even beyond one's field of vision. My mom always seems to know when we've done something we shouldn't. She has eyes in the back of her head! Look, just be very careful not to do personal things during the work day—the boss has eyes in the back of his head.
eyes in the back of your head
If someone has eyes in the back of their head, they seem to notice everything that is happening around them. She has eyes in the back of her head and is always alert to the slightest trouble or sign of trouble. When you have a two-year-old child, you need eyes in the back of your head.