儿子我是你妈咪女儿我是你爹地
[ér zi wŏ shì nĭ mā mī nǚ ér wŏ shì nĭ diē dì]
A nonsensical and playful phrase that defies conventional logic ('Son, I'm your mommy; daughter, I'm your daddy') showing rebellion against norms or seeking attention in a humorous manner.