1. To kiss someone amorously, especially in public. The model and movie star has reportedly been playing kissy-face with an unknown love interest. The teacher yelled at the two students for playing kissy-face in the back of class.

2. To ingratiate oneself to someone through excessively flattering, fawning, or solicitous overtures. Many of his constituents have accused him of playing kissy-face with senators of the other party in order to get his tax bill through.