Supercalifragilisticexpialidocious

Adjective.

A word from the Disney film production of the book Mary Poppins describing any quality that is so indescribable that you have no real word to say it with
"It's Supercalafragilisticexpialidocious, even though the sound of it is something quite atrocious, if you say it loud enough you'll always sound precocious, supercalifragilisticexpialidocious!

Me: This pizza is Supercalifragilisticexpialidocious!
You: It's what!?
Me: It's Supercalifragilisticexpialidocious!
You: What does that mean?
Me: The pizza is better than AMAZING!
You: Oohhh, kk.