爹爹没胸奶奶没鸡
[diē diē méi xiōng năi năi méi jī]
A rather indecorous expression which combines parts from different people - a father figure lacking a feminine characteristic while a grandmother figure not having a chicken (metaphorically implying some absurd and impossible situation). It's likely used jokingly to describe an unusual, nonsensical scenario, probably popular within a specific subculture online where exaggerated humour is appreciated.