穿上校服我就素好学生
[chuān shàng xiào fú wŏ jiù sù hăo xué shēng]
A play on words, '我就素' phonetically reads like 'I'm so', and the overall phrase means 'once I wear the school uniform, I’m such a good student'. It could express irony or sarcasm about the conformity required in school attire and expectations of student behavior.