Supercalifragilisticexpialidocious comes from the 1964 Disney film Mary Poppins, where Julie Andrews as Mary Poppins sings it with Dick Van Dyke in a song written by Richard and Robert Sherman. The made up word was presented as something to say when you have nothing to say, and it became one of the film's most remembered moments. Decades later the short sung clip circulates on soundboards and in edits, reused whenever a creator wants instant nostalgia, theatrical confidence, or a playful nod to a classic family musical.