Back in the 1970s, "hacking" meant developing software straight from the keyboard without any upfront design, in an unstructured manner. Good programmers could do the design work in their heads and still produce decent code that way, but many of them barfed out spaghetti code. (A large program was only about 30-40KB back then so it was easier to get away with that.)
In the early 1980s, Hollywood twisted the meaning to mean "breaking into systems" (because Hollywood has a big microphone).
Now the term is pretty much ambiguous. I'm not sure which way stux meant it here -- probably the Hollywood version.