two people don't get along with each other; to be at odds with each other
Definitions (粵典–words.hk)
語句
指雙方關係惡劣。門神應該係秦叔寶像貼喺左邊，尉遲恭喺右邊。為咗易於分辨左右，門神像會畫成兩人微微對望。如果兩邊門神調轉，睇落就會變成兩人背對背，不瞅不睬 to become hostile; to turn aggressive and nasty; literally: to paste up the door gods wrongly (since the door gods are normally pasted up so that they face each other, if put up wrongly they face away from each other)