Cult sheep
Someone who is so dumb that you don't even know how it is possible. There is nothing in their head and if you punched their head it would shatter. Derives from cults which have brain washed people and sheep which are extremely dumb animals.
Mike and Pete were such cult sheep that when they punched each others' heads, both of their heads shattered.
Sheep cult
Sheep orgie
I made a sheep cult with my friends