"Um diddle diddle diddle um diddle ay, Um diddle diddle diddle um diddle ay, Supercalifragilisticexpialidocious! Even though the sound of it Is something quite atrocious, If you say it loud enough, You'll always sound precocious, Supercalifragilisticexpialidocious!" Today, nobody quite agrees one what exactly the word 'supercalifragilisticexpialidocious' means. Some say it's just a proper noun and has no other meaning, while others say it means "better than the best". Anyway, in which show did this word first appear? Today, nobody quite agrees one what exactly the word 'supercalifragilisticexpialidocious' means. Some say it's just a proper noun and has no other meaning, while others say it means "better than the best". Anyway, in which picture did this word first appear?