It's like a programming community, but with martial arts exponents. And instead of hackfests, they beat each other up.

Do I win a prize? :-P

This is my favorite definition of 江湖: https://www.youtube.com/watch?v=8rcFoN1Ding&feature=youtu.be...

There is a wikipedia article: https://en.m.wikipedia.org/wiki/Wuxia#Jianghu

But yeah, try translating that in a few words.