肆无忌惮我的她玩世不恭我的他
[sì wú jì dàn wŏ de tā wán shì bù gōng wŏ de tā]
This internet handle refers to two different personalities: a carefree and reckless 'her' who does whatever she pleases, and an unbothered, irresponsible 'him'. It depicts characters with nonchalant attitudes toward life.