The metaphor behind this modern slang term for a computer enthusiast, particularly one who breaks into other computer systems, is not certain, but it is probably one of continually hacking or chopping away at something until it finally gives way.
The noun hack, meaning an attempt or a try at something, is nearly 200 years old. It dates to as early as 1836 when it appears in “Davy Crockett’s” Exploits and Adventures in Texas (this book was alleged to be based on Crockett’s diary, but is a fraud; who wrote it, however, doesn’t matter when it comes to lexical evidence):
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Better take a hack by way of trying your luck at guessing.1
Copyright 1997-2016, by David Wilton