The Wazoo is an animal park in Perth (Short for Western Australia Zoo), which has become so unpopular due to it's poor treatment of animals, that the park has in many means become synonym with shit and arse, as it is some of the worst profanities known to Australians.
Famous mascots; Peter the paraplegic platypus, Ike the inbred iguana and Casper the rotting kangaroo corpse in front of the entrance.
The zoo is also known for it's inbred hairy dogs, the Shit Zoo dogs (Australian spelling: Shih Tzu)
There is a respectable split among vernacularists whether "wazoo" applies to one's rump or one's porker. Ample weight for both definitions. See the delightful example below for both possible interpretations -- tuchus and ding-dong.
A self-important person of very little consequence: see esp. the Frank Zappa album "The Grand Wazoo" and the song titled "Cosmik Debris" (I think that spelling is correct).
"... with the oil of Aphrodite
and the dust of the Grand Wazoo he said,
"you may not believe this, little fella,
but it'll cure your asthma, too!"
-Frank Zappa, from "Cosmik Debris"
