姑娘我不美丽平胸那又怎样
[gū niáng wŏ bù mĕi lì píng xiōng nèi yòu zĕn yàng]
This is somewhat self-deprecating or defiantly assertive statement saying, 'as a woman I'm not considered traditionally beautiful or don't conform physically in certain ways, but so what?' It reflects confidence or indifference against typical aesthetic standards.