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This is an idiom with Spanish origin that states that the person you are talking to is calling you something that they themselves are equally as guilty of doing... Thus an example of psychological projection.

This comes from old times when pots and pans were generally black and kettles were generally metallic and reflective. Therefore the pot sees its black reflection in the kettle and thinks that the kettle is black.
Sydney: you always cheat in any card game we play; all you care about is winning
John: Pot Calling Kettle Black!
by nomusclerussell September 25, 2017
Happy St. Patties Day!