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Adjective: goopy  goo-pee
Usage: N. Amer, informal
  1. Sticky or viscous
    "The cake batter was too goopy and wouldn't pour smoothly";
    - gloopy [informal]
     
  2. Excessively sentimental
    "The movie's ending was too goopy for my taste";
    - gloopy [informal]

Encyclopedia: Goopy