Mom, what cha got?

So the other day I was doing laundry and David came in and says, Mom, what cha got? Not knowing what he is talking about I said, Nothing! Then he proceeds with the same question pulling at the back at my pants! Here is how it played out.

David: Mom, what cha got a penis, you got a penis in there?

Me: No, baby I have a vagina!

David: A Ba gina?! You got a Bagina?

I about died. How does my kid come up with this stuff. Random!