我要叫你丑八怪我又不丑不能叫
[wŏ yào jiào nĭ chŏu bā guài wŏ yòu bù chŏu bù néng jiào]
The phrase literally says, 'I want to call you an ugly monster but I'm not ugly so I can't', reflecting someone with a mischievous sense of humor who plays around with names but refrains due to their own characteristics, showing self-confidence and awareness of appearance while also teasing.