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Adjective: supercalifragilisticexpialidocious  ,soo-pu(r),ka-li-fra-ji,li-stik-,eks-pee-,a-li'dow-shus
  1. (informal) extraordinarily good or wonderful; used as a nonsense word to express delight or approval
    "The party was absolutely supercalifragilisticexpialidocious!"

Encyclopedia: Supercalifragilisticexpialidocious