The homonym of 666 is “牛牛牛（niú niú niú）” ，which usually used to describe someone or something very powerful, very awesome，very strong, convincing and praise.
This word first seem at LOL games, when a gamer do a good job, other viewer of player type “666” to praise. Because the sound of 6 is similar with Chinese word “溜 liù” which means successful and smooth, “666” becomes popular.
Nǐ zhè bō cāo zuò zhēn shì liù liù liù。
You are really awesome(on this thing/action)
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