can't tell (one's) arse from (one's) elbow

(redirected from can't tell our arse from our elbow)

can't tell (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's can't tell her arse from her elbow.
See also: arse, elbow, tell
References in periodicals archive ?
If we don't know where our organs are, perhaps we really can't tell our arse from our elbow.
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