I have watched this subtitle like the capture. This is “ What do you mean what am I doing?”.
But I am curious the correct sentence should be "What do you mean what I am doing?"
Usually I am familiar with
< What do you mean by that? > or
< What do you mean by something? > or
< What do you mean Subject Verb ~ blah blah ~? >
That's why I think the correct sentence is “What do you mean what I am doing?”. Am I wrong?