Fat shit
It's a self esteem club where you all call each other fat shits until you feel better about yourself.
Example:
Eliza, you're such a fat shit.
Jess, you're a fatter shit!
Doesn't matter, Maria's the fattest shit!
Eliza, you're such a fat shit.
Jess, you're a fatter shit!
Doesn't matter, Maria's the fattest shit!