Hacking (as per original MIT definition) means doing something clever or novel because of the love of the medium not to satisfy some sort of demand or business opportunity.
It's in the spirit of "look at this cool thing you can do".
I'm sure you're familiar with free(libre) software already and "libre hacking" is just that - some relatively useless fun programs or tools that people share under libre license.
My favorite example that I use every day would be doge[1] project that just prints a doge meme based on your terminal history whenever you startup your terminal. It has no real purpose other than make you smile an appreciate technology from the novelty point of view.
It's in the spirit of "look at this cool thing you can do".
I'm sure you're familiar with free(libre) software already and "libre hacking" is just that - some relatively useless fun programs or tools that people share under libre license.
My favorite example that I use every day would be doge[1] project that just prints a doge meme based on your terminal history whenever you startup your terminal. It has no real purpose other than make you smile an appreciate technology from the novelty point of view.
1 - https://github.com/thiderman/doge