"Plant one" is a term used to describe an act of kissing. There are plenty of synonyms for this phrase, and some of them are quite creative. Some examples include smooch, peck, kiss, buss, smack, nibble, and lock lips. Other terms that indicate a more passionate or intense kiss include make out, snog, French kiss, and tongue action. Whatever term you choose to use, make sure it's appropriate for the situation and the person. A well-timed and appropriate "plant one" can be a sweet gesture of affection or even the start of a new romance.