姐的妖媚你羡慕不起
[jiĕ de yāo mèi nĭ xiàn mù bù qĭ]
'The bewitching beauty as the older female, can not envied by you.' Here 'the old sister' refers to females who consider themselves older. They call themself 'jiejie(older sisters)' with a sense of vanity. They want to show they possess an enchanting charm while others don't.