/hi:'per-spays/
n. A memory location that is far away from where the program counter should be pointing, often inaccessible because it is not even mapped in.
"Another core dump -- looks like the program jumped off to hyperspace somehow."
Compare jump off into never-never land.
This usage is from the SF notion of a spaceship jumping into hyperspace, that is, taking a shortcut through higher-dimensional space -- in other words, bypassing this universe. The variant east hyperspace is recorded among CMU and Bliss hackers.