Sitting on a pity pot is the same thing as sitting on a pity potty, but sounds slightly more mature.
Both involve feeling really sorry for oneself.
Tom: "He just sits on his pity pot all day long."

Dick: "Yes, and cries crocodile tears too."

Harry: "How sad."

Tom & Dick: "Don't encourage him!!!"
by astridstone April 19, 2008
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