我是修炼千年的大姨妈
[wŏ shì xiū liàn qiān nián de dà yí mā]
'I'm Aunt Period after a thousand years of training.' In China, 'Da Yimama' (大姨妈)is internet slang meaning period/monthly menstruation cycle which anthropomorphized as an aunt figure coming periodically. And there're lots of legends associated with immortal creatures who need centuries of meditation to reach higher spiritual realms. So it might refer to some kind of unique sense of humor or sarcasm expressing tiredness towards recurring event in long term manner.