孤独劣人
[gū dú liè rén]
'孤独劣人' means 'The Bad Person In Loneliness.' '孤独' refers to the sense of loneliness or aloneness, while '劣人' usually signifies someone who behaves naughtily or poorly. So in a light-hearted manner, this nickname could express the humor and personality trait of being a little bad or mischievous when in a solo state. Or on another level, it might imply the person feels he/she may act less constrained or less socialized while in seclusion or in isolation.