To be under a rock means being unaware of something that most other people know about. It is used when someone seems completely out of touch with recent news or popular events.
The expression comes from the image of a creature hiding under a rock, cut off from what is happening outside. Because it cannot see the world around it, it knows nothing about what is going on.
The expression comes from the image of a creature hiding under a rock, cut off from what is happening outside. Because it cannot see the world around it, it knows nothing about what is going on.
Have you really not heard about the new movie everyone is talking about, or have you been living under a rock?