I think it's called fat acceptance, fat pride, BBW positivity etc, and other such nonsense.
I was also at school in the late 90's and I can only recall two girls who were really, really over weight. They were sisters. The eldest was nicknamed 'Earthquake' and her year younger sister was known as 'After Tremor'. Horrible, I know....
These days, publicly, us guys have to embrace and accept the chubby women...peer pressure. But this thread has 500+ pages of pictures of slim women. That's what we really find attractive, isn't it? Yes, we all have our nuances, but this thread overwhelmingly suggests that we prefer women who are slim.