In my family, if a kid (such as myself, for example) tended to talk a lot, they'd say "he was vaccinated with a Victrola needle" (because, for the younger readers who are possibly ignorant of history, vaccines were originally applied by scratching the skin surface with a needle, and a Victrola was an early record player with an actual needle for converting the grooves into vibrations - so perhaps some of the capacity for endless automatic patter carried over with the vaccination)