I was reading the comments and answers to this question, and among them I found this:
"And Java never was cool, simply because it threw the hacking part out of programming"
and this:
"And javascript is very hackerish language so after developing your frontend you feel very constraint when you return to java."

What's the "hacking part" in programming, and what makes a language "hackerish"? What are some good examples of languages and features in languages that you would call "hackerish"?

(Someone might say that I shouldn't be confused by the word "hackerish", that's it's not really a "proper" English word or something like that, but that's besides the point)