Well I learned this in my ancient history on sesame street! The longest word is not Snufflelufagus like you thought! It is actually: Abcdefghijklmnopqrstuvwxyz! And you say it like this: Ab-cee-def-gee-jeckle-mernop-kur-stoov-wik-siz!"

Again, who else could bring you this earthshaking knowledge? Your welcome!