JRST

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

JRST

   /jerst/ [based on the {PDP-10} jump instruction, obsolete] To
   suddenly change subjects, with no intention of returning to
   the previous topic.  Usage: rather rare except among PDP-10
   diehards, and considered silly.  See also {AOS}.

   [{Jargon File}]