popj

from The Free On-line Dictionary of Computing (8 July 2008)

POPJ

   /pop'J/ [{PDP-10} return-from-subroutine instruction]. To
   return from a digression.  By verb doubling, "Popj, popj"
   means roughly "Now let's see, where were we?"  See {RTI}.

   [{Jargon File}]