Supercalifragilisticexpialidocius

Supercalifragilisticexpialidocius is a word from the movie / film Mary Poppins, it's used when something is so. Well, indescribable

Supercalifragilisticexpialidocius even though the sound of it is something quite atrocious, if you say it loud enough you'll always sound precious supercalifragilisticexpialidocius!