凉薄嫁衣
[liáng bó jià yī]
In Chinese, the word ' 凉薄'(liang bao) refers to someone emotionally cool or cold-hearted while ' 嫁衣'(jia yi) means wedding dress. So this nickname implies someone who feels distant from warm human connections even in something traditionally considered romantic or emotional like getting married, reflecting some disillusionment with relationships or love.