kiss up verb 2kiss-up noun 1forms 4 verb2 •To pay false flattery to another, particularly a superior at work, in order to get special attention.Yes, I watched Joe kissing up the boss and was very annoyed when he got my promotion! •To pay false flattery.He kisses up more than he works. kiss-up noun1 •(informal) One who flatters a supervisor, or superior, in order to get special attentionJoe got that promotion because he was a kiss-up, not because he knew the job. formskissed up · kissing up · kisses up · kiss-ups