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

1.
relamerse, chasquear los labios
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.
Los niños estaban relamiéndose al ver el pastel de cumpleaños.
•
He smacked his lips, imagining the delicious meal.
Él se relamió, imaginando la deliciosa comida.