旧人滥心r旧梦失辞r
[jiù rén làn xīn r jiù mèng shī cí r]
The first part of the nickname (旧人滥心r) conveys someone has been overly indulged emotionally ('烂' - deteriorated) in their feelings towards previous partners/friends. The latter (旧梦失辞r) refers to old dreams lost due to lacking proper explanation/words for them - overall expressing nostalgia, regret.