穷胸不举
[qióng xiōng bù jŭ]
The term combines 'being poor' and 'having sagging breasts', it could be a derogatory term to point out someone with little money who lacks fullness in breast size, or used as self-mockery. But such words are sensitive, involving issues like body-shaming, and aren't encouraged outside specific, private contexts among close ones understanding boundaries established between each other mutually respecting manner.