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have shit for brains
rude slang To be very stupid; to be incapable of learning something. I know I have shit for brains, but I'm really trying my hardest! My brother's got shit for brains, always trying to pull some boneheaded stunt that lands him in jail.
have shit for brains
tv. to be exceedingly stupid. (Usually objectionable.) You have shit for brains if you think you can get away with it.