痞子叔叔平胸婶婶
[pĭ zi shū shū píng xiōng shĕn shĕn]
It refers to 'uncle' and 'aunt', playfully or mockingly using 'ruffian' and 'flat-chested' to characterize them, hinting at a casual, even somewhat disrespectful, portrayal of elder family figures. Often found in youthful humor culture.