Mom: I brought you some Hulk ice pops!
Kid: Mom! That's SUPER­CALI­FRAGI­LISTIC­EXPI­ALI­DOCIOUS! Thanks! I just finished the torrent of all the Hulk comics in e-book form!
Mom: How cute!

It's from the Classic movie Mary Poppins. Many dont know the spelling or what the meaning is. So you can basically just make that one up yourself.

Bob: OMG OMG OMG
Suzy: What?
Bob: SUPER­CALI­FRAGI­LISTIC­EXPI­ALI­DOCIOUS
Suzy: Pardon me?
Bob: SUPER­CALI­FRAGI­LISTIC­EXPI­ALI­DOCIOUS
Suzy: :| *walks off*