Supercalifragilisticexpialidocious is a nonsensical word sometimes used to describe something as great or extraordinary. Supercalifragilisticexpialidocious is used especially by children to describe something as being really good.
''That was Supercalifragilisticexpialidocious! will we ever se that again?''
Even though the sound of it is something quite atrocious. If you say it loud enough. You'll always sound precocious.
"I was afraid to speak when I was just a lad. My father gave my nose a tweak and told me I was bad. And thenone day I heard a word to save my aching nose. It was the biggest word you ever heard, and this is how it goes, Supercalifragilisticexpialidocious."