Smack, v. t. 1. To kiss with a sharp noise; to buss.
2. To open, as the lips, with an inarticulate sound made by a quick compression and separation of the parts of the mouth; to make a noise with, as the lips, by separating them in the act of kissing or after tasting.
Drinking off the cup, and smacking his lips with an air of ineffable relish. Sir W. Scott.
3. To make a sharp noise by striking; to crack; as, to smack a whip. “She smacks the silken thong.” Young.