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

(redirected from don't know your arse from your elbow)

doesn't/wouldn't know (one's) arse 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 arse from her elbow.
See also: arse, elbow, know
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