A fork of Rural Dictionary
Stupidity; idiocy; etc. A person who has "shit for brains" behaves stupidly. "Shit for brains" refers to brainlessness.
Gee, Jim, you are one stupid ass; you must have shit for brains!
A dumb person. An imbecile or idiot
Example My brother-in-law is a dufus
My brother-in-law is a dufus