How to say"你知道我在说什么吗"in English?

你知道我在说什么吗?
you know what I am speaking?
you know what I am talking about?

Do you know what I mean.
Do you know what I talk about.

Do you know what I am saying?

you know what i'm talking about?
do you have any idea what I'm talking about?

来个准确的：do u know exactly what i m talking abt

U know what i said?