The story
From its sharp stipular thorns growing in pairs along its branches, one straight and one recurved. The plant "kissing you" refers to when someone brushes past or "comes" in contact with the thorns, the straight thorn gently catches their clothing or skin and pulls it inward. Pulling away or backing out, the recurved thorn digs deeper and trapping them.
Etymology from Wiktionary, CC BY-SA 4.0.