That’s PRD 网站杂志
666, adv., very proficient in a skill; a task done extremely well.
英文报刊来源： That’s PRD China. 翻译：蜜雪老师
A. Little Zhang just asked out the prettiest girl in the office and she said yes.
B. Wow. 666.
A. More like 666666.
Imagine you are playing an MMORPG (Massively Multiplayer Online Role-playing Game) and your teammate just made a beautiful kill that saved your life. Your manners demand that you say thank you to your teammate. Can you type out ‘well done’? No! That’d take more seconds than you have right now because you are still in battle! Instead you press the number 6 for a couple of seconds and send out a ‘666.’
想象你在玩网游，你的队友大开杀戒拯救了你，处于游戏礼节应该和队友道谢，打字就太花时间了，你可是在战役中耶！ 于是你打出一串666 就好了！
Phonetically the same as the character 溜(liū) that means ‘proficient’ or ‘smooth,’ 666 is the universal online compliment for a task well done in games, an argument well-articulated on online forums, or a sentiment accurately described in the comment section. No need to choose input language or even use more than one key on the keyboard – you’ve commended your comrade and behaved like a community-minded and well-mannered online person. How efficient!
The more 6s there are, the higher the compliment is. A long string of them means the deed commands such high praises that someone pressed the ‘6’ key for many precious seconds.
越6， 这种“赞 “就证明越多。 一大长串的66666 就意思狂赞….
Unlike in the Christian world, where the number 6 is associated with the devil, 6 has a positive connotation in the Chinese language and culture, due to its pronunciation being the same as liū. Things associated with the number 6 are said to always go smoothly. Phone numbers with 6s in them even cost extra at the telecom shops
在西方基督世界，数字6 与邪恶相关，与此相反，中文的6 由于发音关系，却表示好运和积极向上。与6有关的词往往表示顺利，电话号码含有6的甚至得多花钱购买。
666 can also be used in a self-deprecating way. You type ‘666’ when you clearly screw up, similar to the self-deprecating and sarcastic saying of ‘nailed it.’
但是666 也有表示一种不以为然的自嘲态度，你搞砸了一个事情的时候打出666， 就是以一种反讽语气说出 ”我搞掂了。”
Remember, the internet is just like a society in that you get what you put in. We should all give each other a compliment once in a while and give credit where it’s due, so that we can all have a good time in the wide cyber world.
Things are Made to Happen