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well, I'm not sure if it's an idiom.

I'm watching "In cold blood" and there is phrase "I don't know gold dust from diarrhea" and after that they are talking about "prospecting gold".

Does the phrase mean "I cannot tell gold dust from diarrhea" or something else?

Thanks in advance!
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Hi,
Welcome to the Forum.

I'm not sure if it's an idiom.No. It's not something that is commonly said.

I'm watching "In cold blood" and there is phrase "I don't know gold dust from diarrhea" and after that they are talking about "prospecting gold".

Does the phrase mean "I cannot tell gold dust from diarrhea" Yes
or something else? Such expressions are often used figuratively, with the meaning of 'I am not a smart person'. They are often followed by 'but',
eg I can't tell (ie distinguish the difference between) left from right, but I know that you're a liar'.

Best wishes, Clive
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WOW! I didn't think I could get such a prompt reply and a so detailed one!! Thank you so much, Clive!

And this is an amazing forumEmotion: stick out tongue
 khoff's reply was promoted to an answer.
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