Ha ha. Do you just want to understand Missy Elliot's song or are you studying to be a rapper? I would say "Why are you confronting me?" or "Why are you being confrontational?" is a good translation. In the chorus of the song, I think Missy Elliot is saying, "Why are you telling me what to do? You don't pay my rent. But can you? Will you? You should be paying."
Although I think some songs are excellent for helping an English learner with pronunciation and grammar, other songs are abysmal, especially rap, or in this case, a rap with a little melody. From an English teacher's viewpoint, the language in this song is a mess!