overflow pdl

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} seems to be primarily an MITism; outside MIT this
   term is replaced by `overflow {stack}'.