Como dizer "estou voando" em inglês

Wassup?

I’m studying English Language and Literature at University and tonight the sentence “estou voando” came up in my mind. How can I say “estou voando” in English?

I’ve got a friend who’s a native English teacher; he’s an American. He speaks Portugues very well and could pass himself off as a Brazilian guy without a problem.

I asked him about it. He told me that there is a particular way to say that in USA but he couldn’t remember it at the time. I know there are many other forms, counterparts, like “I’m not following you”, “I’ve missed the point”, “I can’t understand” and what have you, but I wanted as close as possible to our “estou voando” in the sense of not understading anything at all.

Sorry if I’m pushing too far, but if someone could sort this problem out I’d be very thankful.


OBS: please, don’t say “I’m flying”! hehehe… just kidding!