talk over head

talk over (one's) head

To talk about things that one cannot follow, understand, or comprehend. Your presentation shouldn't focus on the technical details too much; you don't want to talk over everyone's heads. I hate the way he always tries to talk over my head, as if I'm too dumb to understand what he's talking about.
See also: head, over, talk

talk over someone's head

Fig. to say things that someone cannot understand; to speak on too high a level for one's audience. The speaker talked over our heads and we learned nothing. It is not a good idea to talk over your audience's heads.
See also: head, over, talk