Everything they were saying to him seemed to be going over his head.
Most of the talk goes over my head at the table.
"You have no reason to believe that I would go over your head."
"It would have looked like I was trying to go over my head."
Going over her head, she said, will damage your relationship further.
And since Data was a machine, it went right over his head.
Somebody may go over your head; and if he does, let them.
"You don't want me to go over your head with this decision."
So then, I thought oh no, it's just gone over my head this!
I'll go right along with you, over your head, in the air.
Idiome