你是我的小呀小节操
[nĭ shì wŏ de xiăo yā xiăo jié cāo]
Translates roughly to 'you are my small integrity,' though this is likely meant humorously. 'Jiecao' often refers to principles or self-discipline, which in casual contexts can imply 'self-restraint.' A playful nickname might highlight quirks associated with maintaining proper conduct while hinting at endearment.