Bat lau dung laai (Chinese: 不漏洞拉 or 北漏洞拉; Jyutping: bat1 lau6 dung6 laai1) is a Hong Kong Cantonese corruption of the Vietnamese phrase bắt đầu từ nay, meaning "from now on" (bắt đầu = begin, start; từ = "from", nay = "now", IPA: /ˀɓɐʔk̚˦ˀ˥ ˀɗɜw˨˩ tɨ̞̠ɰ˨˩ nɐj˧˥/)).The phrase was made famous in the 1980s and 1990s in Hong Kong, due to a Vietnamese-language radio public service announcement that was broadcast, nearly hourly, on public radio broadcaster RTHK.

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