The Free On-line Dictionary of Computing (30 December 2018):

Program Design Language

   Any of a large class of formal and profoundly useless
   pseudo-languages in which management forces one to design
   programs.  Too often, management expects PDL descriptions to
   be maintained in parallel with the code, imposing massive
   overhead of little or no benefit.

   See also flow chart.

   (1995-04-01)