Dropped?

A lady who's the mother of a boy who used to go to the same nursery as Louisa and a friend of my neighbour, waited for me at the gate of Louisa's school today. I greeted her and she kept asking me 'has she dropped yet, has she dropped yet?' I was like 'hmmm.....' and didn't have a clue what she was talking about. She saw my puzzled face and went 'your neighbour'. Then it clicked. She's asking me if my neighbour, her friend, has given birth. So I replied 'Oh! No, she hasn't. I saw her yesterday and her tummy's still very big.' These two ladies are from Nigeria and I guess that's the way they put it in Nigeria - 'drop?' = 'give birth?' I learn something new today.