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.
"How's your Father?
How's your Mother?
How's your charming sister Sue?
And, speaking of your family, how's your old Wazoo?"
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