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1.
A flipping of the syllables in stupid, invented by first-graders in that blissful year where the word stupid is a horrible swear.
Person 1: "That's so stupid!"
Person 2: "Oh my gosh, what did you just call it?"
Person 1: "Oh, sorry, it's so pidstu, then."
by Borkborkbork August 14, 2010