资料来源 : Free On-Line Dictionary of Computing

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 {MIT}ism; outside MIT
        this term is replaced by "overflow {stack}".