- (used as a nonsense word by children to express approval or to represent the longest word in English.)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Word Origin and History for supercalifragilisticexpialidocious
from song in 1964 Disney movie version of "Mary Poppins;" subject of a lawsuit based on earlier song title "Supercalafajalistickexpialadojus" (1949), but other versions of the word also were in circulation.
Online Etymology Dictionary, © 2010 Douglas Harper