At dinner with my brother this week one of my 8 year olds came out with this kind of 1950s expression I've never heard before - said "mummy had lost her figure" or something. It was very funny the way he said it (not that I'm fat or anything) and my brother said I hadn't. I would have thought that was a more typical exchange even within the family.
There are a lot of different themes on this thread. It's interesting.
Should we correct children at home and school so they speak "properly" (in my terms) or do we mock them if they change. Someone below mentioned a child going to university and coming back speaking differently and I've noticed some difference in my children but I just find it fascinating to watch. What is interesting is their speech improved when they went to university and you might have expected the opposite or perhaps they just decided to abandon certain figures of speech that they needed to have in their schools as teenagers.
One thing I'm not keen on is the aggression in some speech. I don't like "mate", correct the twins if they say it. Don't like high fives (not speech but same thing). It's a forcefulness, a kind of language of the street based on a culture of violence.