我愿为国捐出班主任
[wŏ yuàn wéi guó juān chū bān zhŭ rèn]
Translates to 'I am willing to offer my homeroom teacher for the country'. It seems playful exaggeration. Considering cultural context, it likely alludes humorously (or satirically) to sacrifice and duty to society/country, but with an unexpected object of offering up one’s homeroom teacher instead of oneself.