Without a pot to piss in
They used to use urine to tan animal skins, so families used to all pee in a pot & then once a day it was taken & sold to the tannery. If you had to do this to survive you were “piss poor”.
But even worse, there were the really poor people who couldn’t even afford to buy a pot. They “didn’t have a pot to piss in” and were the lowest position you could get in that society
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