What is "simpsoncalifragilisticexpialacious"

"Simpsoncalifragilisticexpiala(Annoyed Grunt)cious", is the thirteenth episode of The Simpsons' eighth season. It originally aired on the Fox network in the United States on February 7, 1997. After Marge becomes stressed, the Simpsons hire a new nanny, a Mary Poppins parody, Shary Bobbins (voiced by Maggie Roswell), who tries to help them become better people. It was directed by Chuck Sheetz and was written and executive produced by Al Jean and Mike Reiss. It would also prove to be the last episode for which Mike Reiss received a writing credit. In 2014, Al Jean selected it as one of five essential episodes in the show's history.