What does that even mean?
This concept, I cannot fathom. I understand that not everyone "needs" to have a job, but unless you married into money or are going to school fulltime, my belief is that you should work. This is not 1947. I do not see why some ladies scream this from the rooftops like it is something to be proud of.
In my opinion, it is just lazy, with a CAPITAL L. If you are able bodied enough to work, and you have no obligations that prohibit you from working, why not work. Even if every little bit goes into a savings account for emergencies or a baby, it's still more than what you would have if you didn't work at all.
Please, if there is a sensable reason that one would choose to be a "stay at home wife" please enlighten me.