Ass-burgers Syndrome
This is when a retarded person eats nothing but McDonalds which results in severe constipation as the partially digested burgers get stuck in the ass.
"James is autistic which has contributed to his ass-burgers syndrome. The local McDonalds has been instructed by the authorities to serve James no more than five burgers a day so as not to exacerbate his ass-burgers syndrome."