Hello John, I think the line is: "If you are here, who's running heaven?" The speaker is calling the person they are speaking to god since only god runs heaven. This may be meant as a compliment or a sarcastic insult...depends on the context and tone. Hope that helps!

Hi. This is not a really common expression. It means the person you are talking to as a very high opinion of themselves. In fact they think they are God.