I personally don't know where and how this "big is beautiful" idea came about. I'll wager it has it's origins in some crazy cattle culture somewhere or some crazy island where the man with the fattest wife holds the most power like some fucked up version of a county fair.
That said I'm well aware of the empowerment that many have drawn from the revolutionary words of activist Sir Mixalot, however and I quote "Little in the middle, big in the back!", meaning that not even he advocated a corpulent corpus.
No matter the origin of the idea, (which probably came about because re-labeling is simply easier than taking the effort to lose weight) it seems to be a rapidly spreading trend for fat girls to call themselves BBW's. I regret to inform them however that their BMI's are not attractive. There are places that people simply should not jiggle, there are health issues to consider, and there is the matter of caring enough about yourself to at least make an effort.
As I say that I'm a thick man. I'm not morbidly obese, yet, and have made a constant half-assed effort to lose weight involving exercise a couple times a week and some conscientious eating that has kept me from spiraling (or perhaps rolling) over the precipice into Kevin James-ian proportions. I could easily date a "thick" girl, though I honestly prefer thin. Huge mungous girls are however going to find themselves out of luck with me. I just find it unappealing, and I know that as little effort as I'm putting in could easily be done by anyone.
If all of this labeling is okay I'd like to submit that we re-label all sorts of unattractive conditions. A jobless man for instance is a real turn-off to any woman. Perhaps jobless men could start calling themselves "Full Time Lovers" or FTL's, and never have to worry about finding employment. The mentally challenged could be called the GOP and the list goes on and on.