smack your lips
US /smæk yʊər lɪps/
UK /smæk yʊər lɪps/

1.
舌なめずりをする, 口をくちゃくちゃ鳴らす
to make a sound by opening and closing your mouth, especially to show that you are enjoying food or thinking about food that you want to eat
:
•
The children were smacking their lips at the sight of the birthday cake.
子供たちはバースデーケーキを見て舌なめずりをしていた。
•
He smacked his lips, imagining the delicious meal.
彼は美味しい食事を想像して舌なめずりをした。