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It is defined as that which is in reference to the area or subject matter concerning the badunkadunk.

The badunkular region of the human body is located below the small of the back, but before the top of the legs.
She kicked me in the badunkular region, or
I wish to make sweet badunkular love to that woman.

Also, I have badunkular cancer or is smells like a badunkular bomb went off in here...
by Jimmy Dice Clay October 29, 2009