小三要跳楼我在下面喊加油
[xiăo sān yào tiào lóu wŏ zài xià miàn hăn jiā yóu]
This username translates to 'When the third party is jumping from the building, I'm cheering from below'. It is a sarcastic or cynical way of expressing how some people can be heartless or even enjoy others' misfortune.