1. kiss ass - Noun
2. kiss ass - Verb
kiss ass (third-person singular simple present kisses ass, present participle kissing ass, simple past and past participle kissed ass)
(US, idiomatic, vulgar, colloquial) to flatter or perform favors excessively, especially to receive preferential treatment from a boss or other superior; to behave obsequiously.
kiss-ass (plural kiss-asses)
(Canada, US, slang) An obsequious person who tries to win the favor of someone, usually their superior.
kiss-ass