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lick (one's) lips
To be eager and/or show signs of excitement before or during doing something that one enjoys or that is or will be beneficial to one. A reference to literally licking one's lips in anticipation of eating something delicious. All of the scouts are really licking their lips to get Jones on their roster. You should have seen John at the car show—he was practically licking his lips.
lick one's lips
Fig. to show eagerness or pleasure about a future event. (From the habit of people licking their lips when they are about to enjoy eating something.) The children licked their lips at the sight of the cake. The author's readers were licking their lips in anticipation of her new novel.