Kenji,
A wazoo is slang for......up your buttocks :o

Buttocks....? Ah! It's "ketsu" in Japanese. :o

Buttocks....? Ah! It's "ketsu" in Japanese. :o

Kenji,
So if I wanted to say...."up yours" in Japanese it would be.....ketsu? Just a phrase I would love to keep filed away for the occasinal situation where someone peeved me off.