What is Badadunkadunk?
1.
If I'm not mistaking, you're thinking about Missy Elliott's song "Work it" and when she says "Badonkadonkdonk", she's not saying the correct word..
(A Badonkadonk is an extremely fine, big, nice, sexy (mostly female) behind.
-Oh my GOD! Look at the badonkadonk (correct spelling) (or badadunkadunkdunk, as you spell it) on that girl over there!
-Mhhmm...
2.
Undetermined orifice of the body.
My badunka - dunk - dunk