doesn't/wouldn't know (one's) ass from (one's) elbow

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doesn't/wouldn't know (one's) ass from (one's) elbow

rude slang Is very stupid or dimwitted. I'm not surprised to hear that she got lost two blocks away from her house—she doesn't know her ass from her elbow.
See also: ass, elbow, know
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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