What do we got was probably not intended, but whaddya got or whadda we got, the compressed verbalization of what've you got or what've we got, in turn a contraction of what have you got or what have we got? Alternatively, it may be a mental conflation of what have we got and what do we have, which would be more widely accepted ways of asking the same thing.
Regardless of the explanation, it is the sort of slip in speech that would go unnoticed in everyday conversation, or in television scripts, especially because it is already casual. If whaddya got here? is meant to ask literally what is on hand, for instance if asking what flavors are available at an ice cream parlor, you could more formally say What do you have? If you are asking a subordinate for something that was assigned to them, you might ask What do you have for me? If it is an exclamation of surprise, you could ask What do we have here? But in conversational American English, these all sound rather stiff, and can be distancing.
I am less sure about British English, as have, have got, got and have gotten are all used differently— it is, some say, the most distinctive difference between the dialects— and so the world is full of opinions disparaging one or the other use as too informal or just wrong. You'll find notes on the matter in good dictionaries— see for example get in the Merriam-Webster Learners Dictionary or at Oxford Dictionaries Online, or various blogs.
Both are fine, depending on context you might want to add "about"
I like the sentence someone said (about)...
I love this sentence someone said (about)...
If you use this usually you might quote the actual sentence you like.
I like the sentence President Kennedy said about going to the moon.
I love this sentence President Kennedy said: "Ask not what your country can do for you, ask what you can do for your country."
Best Answer
You have it right. As a single question, we would write:
However, the way you have punctuated these six words makes the wording acceptable in your second example. The first question ("Do you know?") is a lead-in to the second ("Who is he?").
When written that way, I imagine the speaker being rather excited. Perhaps there is a lot of buzz in the street as a celebrity is walking by. Someone might excitedly say to a friend, "Do you know? Who is he?"
I think in a more calm and collected state of mind, the question order is likely to be reversed: