劣迹

'劣迹' (liè jì) directly means 'bad track record' - it refers to a person's history of bad actions. It carries connotations of past transgressions or indiscretions that have stained the user’s reputation. While not exactly a positive title, such a handle could either indicate self-awareness of their checkered past or an ironic twist from someone who does not necessarily align with what the nickname implies.