apart from the other explanations on here , its also a brand name of paint brushes, extremely fine well made genuine horse hair/ sable hair paint brushes, that are by my standards really good brushes, and can be used to differentiate between some brushes, its usually not the case when using this slang term but does come out like this some times
hey hand me that perdy over there,
thats not a perdy brush
i only paint perdy
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