Definition
The regrettable streaks and residue left in the toilet after a particularly aggressive bowel movement—a bathroom reality nobody wants to discuss but everyone secretly knows.
Example Usage
That burrito last night left some serious porcelain paint; I should've warned the next person.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=porcelain%20paint&defid=4604307)
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