闺蜜我爱他他是你姐夫哥们我爱她她是你嫂子
[guī mì wŏ ài tā tā shì nĭ jiĕ fū gē men wŏ ài tā tā shì nĭ săo zi]
The username humorously describes complicated relationships in family dramas. In a nutshell, the sentence expresses love between friends but hints that their beloved are actually related by marriage (sister's husband or brother's wife).