别和我闹没和你笑
[bié hé wŏ nào méi hé nĭ xiào]
It conveys the meaning of don't expect a good mood when you mess with me because I won't smile with you when you're in a high spirit. In another word, do not play around with me for I am no mood, indicating seriousness and perhaps a slight touch of arrogance and aloofness about not letting oneself be easily approached.