Oh for fuck sake really? Has this question not been answered not a couple of weeks ago on this forum? Let alone the Internet constantly?
Hacking is a mentality. It's about self improvement, tinkering and discovery in unconventional ways, computing or not. It's efficency and finding logical outcomes to problems.
For security "hacking", It's both the mindset and partly the skillset. It does not matter how curious or smart you are, if you don't understand how a particular system works, you can't actually hack it yourself.