Wazoo?? If I didn't misunderstand then I think you are talking about the ablution that we, muslims perform before offering prayers or reciting Quran. Wazoo is an arabic word.

More details can be found at: http://www.iad.org/Pillars/ablution.html

A Wazoo, now isn't that a plastic "musical" toy/instrument that you kind of hum into. Makes a sound something like MEEZ MMEZZ MMMMEEEP MMOOOM to whichever tune you are playing.

Respectfully, I don't think it would go down too well prior to prayers.

I think wazoo is polite for bung hole.
And how did ying yang as in "...up the ying yang" become a synonym?
Oh, and I just learned that Bill Clinton once said, in regards to healthcare costs in the States: "People show up in emergency rooms, and it costs out the wazoo."
OUT the wazoo?? Gross.