What is Fitatty?
1.
A lady or girl of larger proportions who has an especially pretty or striking face. The more extreme the two are the more of a fitatty the subject will be.
Usually will result in a conflict of interest in a mans head.
"She looked hot until she stood up, a proper fitatty."
"John's new Mrs is big but really good looking, a genuine bonefide fitatty."
See
2.
The phenomenon that is a chubby/fat girl with an extremely Hot/pretty face. or a chubby/fat girl who can still make themselves look pretty hot.
Though there are limits
"check out that fitatty over there.."
See