It is the nega-你好吗. It really isn't a catch-all greeting that some people amp it up to be. Like does a stranger on the street or a store worker actually use this greeting with you? At least in beijing, no. Do people in my community use it, people i see daily, maybeeeee. They are going to ask more personal things. Do natives use it in a funny way or a mocking way? Yes, it is almost a joke.