Cantonese 啋(choi1)Interjection in response to something that may bring bad luck.

So in context, you can use this interjection if, for example, someone tells you that your house will be on fire and your missing son will die. You ca say 啋過你把口, which is like “keep your damned mouth shut” but carries an extra sense of warding off bad luck. You can also repeat it several times for strengthened effect. One more thing: this phrase is somehow only used by women.