Shit for brains
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What's the meaning of the phrase 'Shit for brains'?
Extremely stupid.
What's the origin of the phrase 'Shit for brains'?
This term of abuse originated in the USA in the 1960s. The earliest record of it that I can find is David Maccuish's novel Do not go Gentle, 1960:
"Larko's got shit for brains."