Colloquial term used to describe a woman with a large ass and thighs. Comes from the imagined sound of the "junk in her trunk" rolling back and forth as she waddles around-
I.E. dunk-a-dunk-a-dunk-a-dunk.
"Did you see that dunkadunk walk by? 5'2" 260 eeeaaaasy."
by David Jones September 1, 2005
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