What is the context? This does not make sense by itself.

we use it in Stiuatian when you you to sit in a way that you are giving your back to some one ,we are not talking of course about cinema or a theatre.

I still don’t understand. Is this being nice or mean?

I see a lot of confusion here. I could be wrong, but is it possible the phrase was actually, “Excuse me, my bad!” If so, it’s an apology.

Never heard of it. I don't think it's a common expression. It might make sense depending on context.