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

1.
se lécher les babines, faire claquer ses lèvres
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.
Les enfants se léchaient les babines à la vue du gâteau d'anniversaire.
•
He smacked his lips, imagining the delicious meal.
Il se lécha les babines, imaginant le délicieux repas.