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A really smelly version of nu na nu na pee pee. People yell it when they’re so shocked they think they might puke.
'NA NU NA NU POOPOO?!' she screamed after seeing her dog eat a whole pizza.
'He just told the principal he was gonna fail the class. NA NU NA NU POOPOO?!”
When the power went out during the movie, the whole theater yelled it.