The kiss of Judas, also known (especially in art) as the Betrayal of Christ, is the act with which Judas identified Jesus to the multitude with swords and clubs who had come from the chief priests and elders of the people to arrest him, according to the Synoptic Gospels. The kiss is given by Judas in the Garden of Gethsemane after the Last Supper and leads directly to the arrest of Jesus by the police force of the Sanhedrin.

Within the life of Jesus in the New Testament, the events of his identification to hostile forces and subsequent execution are directly foreshadowed both when Jesus predicts his betrayal and Jesus predicts his death.

More broadly, a Judas kiss may refer to "an act appearing to be an act of friendship, which is in fact harmful to the recipient".

More Info: en.wikipedia.org