偶滴裤衩有红花你地裤衩有姨妈
[ŏu dī kù chà yŏu hóng huā nĭ dì kù chà yŏu yí mā]
This internet username humorously compares the speaker's underwear with flowers (which looks clean and fresh) to someone else's stained one (implying menstruation). It's meant to be funny but could be considered inappropriate or offensive as it discusses sensitive personal topics. Note: The language and humor used in this name are quite colloquial, casual and may vary by region.