To smack one's lips and lick them, indicating a strong desire for delicious food or expressing enjoyment of its taste.
尝到奶奶做的红烧肉，他忍不住咂嘴舔唇，赞不绝口。
After tasting the braised pork made by his grandma, he couldn't help but smack his lips and lick them, praising it profusely.
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