右眼皮跳跳大姨妈要来到
[yòu yăn pí tiào tiào dà yí mā yào lái dào]
This nickname uses a funny expression. In Chinese folklore, when your right eyelid twitches uncontrollably, something important or someone important is coming into your life soon. 'Auntie' often refers to 'menstruation', making the nickname humorous by suggesting that menstruation ('big auntie') is on its way.