Obviously these originated in the American South. Even today it is a widely used expression which I believe is of endearment.
Around the world, we visualise Yo Mamma as a somewhat large jovial
traditional black lady - looking after the house a swishing the kids and
dogs from under her feet.
I went to Atlanta with my brother Cliff, who I recently and suddenly
lost from Cancer, the week after that terrible occasion of 9/11.