ass-kissing adjective 1noun 1forms 4 adjective1 •(informal, vulgar) Obsequious; sycophantic.Morgan Berkhardt finished reading my application and saw me watching the video. "Impressive marketing concept, isn't it, Mr Dante?" "Right! Imaginative too," I heard my ass-kissing mouth reply. — 1998 noun1 •(informal, vulgar) The practice of kissing ass; flattery; obsequious behavior. formsass kissings · ass-kissings · more ass-kissing · most ass-kissing