face in a hole
A loud and annoying phrase that sounds like it’s going to get you in trouble, but it’s really just a silly way to tease someone.
He yelled 'face in a hole' across the room and got away with it.
She said 'face in a hole' to her brother and he laughed so hard he fell out of his chair.
They called each other 'face in a hole' and the teacher didn’t even notice.