trampoline

trampoline n.  An incredibly {hairy} technique, found in
   some {HLL} and program-overlay implementations (e.g., on the
   Macintosh), that involves on-the-fly generation of small executable
   (and, likely as not, self-modifying) code objects to do indirection
   between code sections.  These pieces of {live data} are called
   `trampolines'.  Trampolines are notoriously difficult to
   understand in action; in fact, it is said by those who use this
   term that the trampoline that doesn't bend your brain is not the
   true trampoline.  See also {snap}.