The word is buss, and it means 'to touch with the lips' - not necessarily against someone's mouth - to express love, affection or greeting. Can be used in certain moments when a kiss is just too awkward or unnecessarily full-on; or when a friendly nuzzle with the nose just doesn't convey enough meaning.
2. At the party, she had no intention of succumbing to peer pressure, and so a quick buss on her friend's cheek was all the action they would witness.
3. "We'll be okay," he whispered as their house burned down. He felt too saddened to give her a kiss, and so instead risked giving her a guilty buss on the cheek, hoping she wouldn't find out he'd left the stove on.
-Ho brah, you buss already?