not have two brain cells to rub together

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not have two brain cells to rub together

To be particularly stupid; to lack any intelligence or common sense. Oh please, that fool doesn't have two brain cells to rub together—there's no way he could pull off such an elaborate plan!
See also: brain, cell, have, not, rub, together, two
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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The only one I got a laugh out of was Craig and that's because he didn't have two brain cells to rub together.
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