讨厌你就似大姨妈
[tăo yàn nĭ jiù sì dà yí mā]
This is an expression using humor, where '大姨妈' usually stands for menstruation and here compares annoyance with it. It conveys a strong aversion toward somebody by comparing it to something that most find uncomfortable or unwanted: disliking you as much as menstrual cramps.