I'm sitting here on this side of the pond and I've got to admit that this is the first I've heard of it. But according to the Guardian, it's the "latest publishing phenomenon to sweep America," books starring a "new heroine: the young woman who is seriously overweight – and doesn't care."
Really? I must confess that I don't find evidence of the trend entirely convincing – at least not here in the US. Most of the books cited seem to be British titles which have yet to find their way to US bookshelves (such as "The Pi**ssed Off Parents Club" by Mink Elliott and "Love Nest" by Julia Llewellyn). The Guardian claims, however, that, "A slew of books in which the protagonist is not just 'curvy' or 'voluptuous' but is actually 'fat' are about to hit the bookshops."
In Britain there's already a name. They're calling the new genre "bigger chick lit."
Maybe. But of course if these books are only just now "about to hit" US bookshops, we don't know yet whether or not they will find an audience here.