Care to enlighten those of us who are not?

幹你娘. Motherfucker, (lit. "fuck your mom")

Just for etymology correctness, "姦爾娘" would be better than "幹你娘".

There is a lot of detail in those characters. Do you use larger a font size for this script?

I tend to browse HN at 130% zoom, Chinese characters render quite well at that zoom too. Even for English the text size here is rather small though. You don't need to see all the details to recognize words made from Chinese characters though, context (neighbouring characters) and general knowledge of the common characters help fill in the blanks.

This is part of the reason why much larger phones are currently in fashion, and why in Asian countries you'll see people walking around with their phone about a foot in front of their face. It was a real revelation to me when it finally clicked. :)

Size 14 is usually good enough for me, 9~12 are readable/acceptable, and 16+ are comfortable.

Native English speaker here, I still browse HN at 150% zoom because I use displays with a high DPI (Macbook pro retina 15" and the Dell U25 and U27 series screens).

It's just more comfortable that way.