kiss-ass /ˈkɪsˌæs/noun 1kiss ass verb 1forms 4 noun1 •(US, slang) An obsequious person who tries to win the favor of someone, usually their superior. kiss ass verb1 •(informal, vulgar) to flatter or perform favors excessively, especially to receive preferential treatment from a boss or other superior; to behave obsequiously. formskissed ass · kissing ass · kisses ass · kiss-asses