人间作樂無惡不作
[rén jiān zuò lè wú è bù zuò]
It's an ironic expression meaning someone indulges wildly and unrestrainedly. The literal translation would mean doing all forms of entertainment including bad ones, but its common usage carries a slightly humorous and self-mocking tone. People who use this name often enjoy living carefree lives, not bothering too much about what others think.