This is how I was taught how to say it and what it meant, a strange but true story.
Teacher, while climbing up onto his desk, speaking to his 8th grade students, opening minutes of the very first day of class: "Can I hear an ewww?"
Class: "ewwwww"
Teacher: "Can I hear a waaaaa...?" (like in 'wa'ter)
Class: "waaaa"
Teacher: "Now I want to hear a gaaaa!" (like in water but with a 'g')
Class; "gaaaa"
Teacher: "Good, now I want to hear dewwww..."
Class: "dewwww."
Teacher: lastly let me hear a goo!..." (like in goo)
Class: '"goo!"
Teacher: "Now lets put these sounds together: ewwww-waaa-gaaa-deww-goo!"
Class, (it took a few tries but eventually we got it), "ewww-waaa-gaaa-deww-goo!"
Teacher: "Everyone stand up and say it again"
Class, now standing "ewww-waaa-gaaa-deww-goo!'"
Teacher: "Again faster, louder, ew-wa-ga-dew-goo!"
Class: "ew-wa-ga-dew-goo!"
Teacher, literally jumping up and down on his desk, holding his pointer stick like a spear and acting like a bad parody of someone out of a Johnnie Weismuller movie: "ewwagadewgoo!, ewwagadewgoo!, ewwagadewgoo!"
Despite being utterly gobsmacked by what we were witnessing we too were all loudly repeating "ewwagadewgoo, ewwagadewgoo" right along with this REALLY STRANGE teacher.
After a couple of minutes of this the teacher held up his hands and indicated to us that he wanted us to stop and be seated.
Teacher: "Welcome to my Geography Class. If you learn nothing else from my class, the one thing you will for the rest of your lives remember is that the the Capital of Upper Volta, (now known as Burkina Faso), a small country on the continent of Africa is named Ouagadougou.
That class was in 1971 and that teacher was right.
(for more on Ouagadougou: http://en.wikipedia.org/wiki/Ouagadougou )
No, not a word as was asked for by the OP, but the name of a place. I posted this not because Ouagadougou is a delight to say, (it is, try it), nor because of it's obscurity, (yeah right-sure ya did), no, I posted this as a tribute to this teacher. If you are a teacher, you deserve way more honor than you get, my hat is off to you.