Supercalifragilisticexpialidocious

This is a famous made-up word, and it has a tidy internal structure. It has 34 letters and is usually broken into pieces: super, cali, fragil, istic, expi, ali, docious. Each piece is an ordinary English or Latin-style morpheme, but the whole thing has no older standing as a dictionary word. Its meaning is roughly 'extraordinarily good,' and that sense comes from how it is used, not from its parts.

The word is best known from the 1964 Disney film Mary Poppins, where it appears in a song written by the brothers Richard and Robert Sherman. The Shermans are generally credited with coining it for the film, and the film is what made it a household word. Dictionaries now record it as a jocular word meaning something like 'wonderful,' but I'm not certain of the exact dates of its earliest print appearances, so I'd check the Oxford English Dictionary entry before quoting a first-use date.

If you want to dig into the wider family of invented or playful long words, the best place to start is the history of nonce words and of humorous coinages in English. Does anyone know of an earlier printed use that predates the film?

Following up on my first answer, since I said the first-use date needed checking. Here is what I found, and it complicates the idea that the Sherman brothers simply coined it.

• Earliest print. The Oxford English Dictionary (entry "supercalifragilisticexpialidocious") records a spelling, "supercaliflawjalisticexpialadoshus", in Helen Herman's column "A-Muse-ings" in the Syracuse Daily Orange, dated 10 March 1931. She glosses it as meaning "all that is grand, great, glorious, splendid, superb, wonderful."
• The Shermans' own accounts differ. In Walt's Time: From Before to Beyond (1998) they describe hearing a version at summer camp in the Adirondacks in the mid-1930s: "super-cadja-flawjalistic-espealedojus." In a 2007 LAist interview, Richard Sherman said the word came from childhood double-talk. So "coined" is better read as "reshaped and popularized."
• The lawsuit. In Life Music, Inc. v. Wonderland Music Co., 241 F. Supp. 653 (S.D.N.Y. 1965), songwriters Gloria Parker and Barney Young claimed the film song infringed their own "Supercalafajalistickespeealadojus" (1949, recorded by Alan Holmes and His New Tones; a 1951 version also exists). The court denied the injunction; the affidavits showing the word was in oral circulation years before 1949 were part of the reasoning.

So the print record starts 33 years before the film, and the song itself is one stage in a longer playground tradition. Does anyone know of a pre-1931 attestation?