[1] : Jargon File (4.3.1, 29 Jun 2001)

overflow pdl n. mit the place where you put things when your pdl is
   full. if you don't have one and too many things get pushed, you forget
   something. the overflow pdl for a person's memory might be a memo pad.
   this usage inspired the following doggerel:

  hey, diddle, diddle
  the overflow pdl
  to get a little more stack;
  if that's not enough
  then you lose it all,
  and have to pop all the way back.
  -the great quux
  
   the term `pdl' see pdl seems to be primarily an mitism; outside
   mit this term is replaced by `overflow stack' but that wouldn't rhyme
   with `diddle'.


see also:
pdl stack 

[2] : The Free On-line Dictionary of Computing (27 SEP 03)

overflow pdl
     
        the place where you put things when your pdl is full.  if
        you don't have one and too many things get pushed, you forget
        something.  the overflow pdl for a person's memory might be a
        memo pad.  this usage inspired the following doggerel:
     
         hey, diddle, diddle
         the overflow pdl
           to get a little more stack;
         if that's not enough
         then you lose it all,
           and have to pop all the way back.
        			       --the great quux
     
        the term pdl seems to be primarily an mitism; outside mit
        this term is replaced by "overflow stack".
     
     
see also:
pdl mit stack 

Pdl >> P Words
Pdl, definition of term: Pdl
pdl_pag1.html

Overflow >> O Words
Overflow, definition of term: Overflow
overflow_pag1.html