He´s on about???????

[Yeleandraht]

Hello....
It would be great if someone could explain to me what is the meaning of

Mike: 'Do you understand what he's on about?'
Jane: 'No, it's way above my head.'

Correct answer: (d) No, it's way above my head.

Thanks in addition.

Regards from Colombia,

:)

[Beeesneees]

If something is described as being 'above somebody's head' it means that they can't understand it because it's too complicated for them. (Figuratively, the meaning is out of reach.)
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Cheers m' dears!