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A version of multiple personality disorder where instead of constantly changing between multiple personalities you're stuck listening to personalities that are solely in your head critiquing what you do.
Man: "I'd love if they'd stop commenting on everything."
Man 2: "Who?"
Man: "The assholes in my head."
Man 2: "what do you mean?"
Man: "I have peanut gallery disorder."
by MyDefinitionsAreTheBest June 14, 2018
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