大姨妈来袭
[dà yí mā lái xí]
This nickname is often used by girls or women when they are in the menstrual period, 'Da Yi Ma' (Big Aunt) being a colloquial and humorous euphemism for menstruation. The phrase 'Laichi' can mean 'is coming', implying all the inconveniences and discomfort associated with that time.