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

1.
lamber os beiços, estalar os lábios
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.
As crianças estavam lambendo os beiços ao ver o bolo de aniversário.
•
He smacked his lips, imagining the delicious meal.
Ele lambeu os beiços, imaginando a deliciosa refeição.