What is what does supercalifragilisticexpialidocious mean?

Supercalifragilisticexpialidocious is a made-up word that was popularized by the 1964 Disney movie, Mary Poppins. The word is said to mean "something quite extraordinary" or "something that is difficult to describe in words." It has been used to describe something that is impressive, amazing, or awe-inspiring. The word is often used as a playful or humorous way to describe such things. While the word may not have an official dictionary definition, it has become a well-known phrase in popular culture.