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1.
This refers to a butt that is so badonkadonk that its degree of badonkadonk-ness is badong (both bad and wrong).
That be one badongkadonk badonkadonkey!

She way badongkadonk...

That girl badongkadonker than 47 motherfuckers...
by Ben Goertzel January 21, 2007
 
2.
1. Buttocks
2. Ass
3. Teh jelleh
Host: What...is a badongkadonk?
Contestant: Awww man...that's junk in the trunk.
by Emmanuel January 10, 2005