Who Came Up With Supercalifragilisticexpialidocious?

Who Came Up With Supercalifragilisticexpialidocious? Robert B Sherman, half of the famous songwriting duo behind a string of Disney musical hits, has died. One of his most famous co-creations was the word supercalifragilisticexpialidocious. Where does supercalifragilisticexpialidocious come from? Where does supercalifragilisticexpialidocious come from? The word supercalifragilisticexpialidocious was popularized by the 1964 Disney film Mary Poppins.