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

1.
облизываться, чмокать губами
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.
Дети облизывались при виде праздничного торта.
•
He smacked his lips, imagining the delicious meal.
Он облизался, представляя себе вкусную еду.