Haha, I think I understand what you mean, but also, how else would you say uiua? I was at a total loss when I first read it.

I asked Google to describe it and it described how I pronounce it:

"Uiua" is pronounced like "oo-ee-oo-ah", with the sounds flowing together. The "u" sound is like in "boo," and the "i" sound is like in "see," while the final "ua" is a combination of the "oo" sound and the "ah" sound.