天之涯海之角
[tiān zhī yá hăi zhī jiăo]
This username translates as 'the ends of the Earth'. '天涯' means 'ends of the sky' or the horizon, while '海角' refers to the corner or edge of the ocean, collectively signifying the corners of the world, emphasizing distance or a dreamy distant place or person far away, which often carries a romantic and idealistic undertone in Chinese poetry.