upperchatter up·per·chat·ter excessively cheerful and energetic talk. *"upperchatter of an older, less energetic crowd"* a word that does not exist; it

upperchatter up·per·chat·ter excessively cheerful and energetic talk. *"upperchatter of an older, less energetic crowd"* a word that does not exist; it was invented, defined and used by a machine learning algorithm.