I found the word
lopadotemachoselachogaleokranioleipsanodrim-
hypotrimmatosilphioparaomelitokatakechymeno-
kichlepikossyphophattoperisteralektryonopteke-
phalliokigklopeleiolagoiosiraiobaphetraganopterygon
at The Grandiloquent Dictionary (http://www.islandnet.com/~egbird/dict/dict.htm) defined as A goulash composed of all the leftovers from the meals of the leftovers from the meals of the last two weeks . This certainly beats those antidis and flocci words, but do we consider it valid? What say you?

Sorry for the wide screen, it's a long word!

[EDIT: I decided to add some spaces because the wide was too annoying.]