Большой китайско-русский словарь
jiào nǐ shēng háizi méi pìguyǎn
Literally, “May your child be born without an asshole.” A very strong curse. Sometimes 没屁股眼 méi pìguyǎn (may pee goo yen) by itself (“no asshole,” or more technically “imperforate anus”) is used as a curse like “Damn!” Originated in Hong Kong and surrounding southern areas, but now commonly used all over China.