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.
I.E. dunk-a-dunk-a-dunk-a-dunk.
by David Jones September 01, 2005