"SHUUUUUUUUUUUUUSH FATTIES" *the world goes quite in realization that they have been called fatties but don't respond because they've been told to shush* SHUSH FATTIES is an expression used to easily get a bunch of people to stop talking.
Fat mentally handicapped children that run around playing tag at lunchtime during school. They often wear clothing that is too tight and reveals more thannecessary. Often times there is a slight unsavory stench about them.
Jack was listening to those fat, loud people talk on and on until he couldn't take it anymore. "SHUSH FATTIES" he hollered, causing the overweight people to be silent.