When trying to express the idea of someone trying to flatter or impress another person with excessive compliments or gestures, there are several synonyms that could be used instead of "kissed up to." One alternative phrase could be "sucked up to," which has a similarly negative connotation. Other phrases that could be used include "buttered up," "browned-nosed," "boot-licked," "curried favor," or "fawned over." Each of these phrases conveys the idea of someone trying to gain favor or approval by behaving in a subservient or overly flattering way. By using creative synonyms for "kissed up to," writers and speakers can convey their meaning in a fresh and engaging way.