One who illustrates characteristics of both fatness and mental disability
"Man that bitch is such a fat-tard"
of or relating to being extremly fat and stupid at the same time thus being fatly retarded
wow that chance kid is such a fattard.
One who is exceptionally fat and exceptionally stupid.
"Gawd, that fat Debbie is such a fattard."
a fat bastard. this usually applies to parents and/or teachers/priests/siblings/wenchs.
Gabby was telling Diana about how big a fattard her parents were on Saturday.
an overweight or obese and mentally handicapped person.
look at jake over there eating all those donuts like a fat tard