Shinola was an old brand of shoe polish last century. If a person was very stupid, he would polish his shoes with shit and not know the difference.

You can hear the phrase used in the movie “ the jerk”. With Steve Martin.
That guys so dumb “he don’t know shit from shinola!”
by Aceway January 5, 2023
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For many, especially in the Southern US, it means the person referenced is an ignoramus . That is, if the person had their shoes shined. they could easily be fooled by the shine man who could just as well put shit on their shoes as shoe polish
by <br ea sports June 6, 2020
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a defunct American brand of shoe polish.
Shinola was a patented name and trademark for boot polish.A The suffix -ola is a popular component of trade names in the United States.
by SPrice1980 May 9, 2023
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Someone who doesn't know the difference between shit and shinola
The Shinola Kid is asking dumb questions again.
by Hugh Jarse January 14, 2004
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