我没跟你笑你别跟我闹
[wŏ méi gēn nĭ xiào nĭ bié gēn wŏ nào]
Simplifying to 'I'm not smiling at you, don’t start trouble with me,' this expresses a no-nonsense attitude indicating boundaries. It warns potential instigators not to take non-verbal cues out of context, especially for provocation.