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Related to kiss ass: Philematologist
kiss (one's) ass
rude slang To flatter, fawn over, or eagerly agree with (someone, especially a person of higher authority) as a means of currying favor. Primarily heard in US. It's no wonder you're the teacher's favorite from the way you kiss her ass! Look, it's just the nature of this business that sometimes you have to kiss ass if you want to get ahead.
kiss someone's ass
Sl. to fawn over someone; to flatter and curry favor with someone. (Potentially offensive. Use ass with discretion.) What does he expect me to do? Kiss his ass? I won't kiss your ass for anything.
Also, kiss up to. Seek or gain favor by fawning or flattery, as in I am not going to kiss as to get the raise I deserve, or If I could find a good way to kiss up to the publisher, my book would be well promoted. The first, a vulgar slangy usage, was first recorded in 1705 as kiss arse, which is still the British usage. The variant, a euphemistic blend of kiss ass and suck up to, dates from the late 1900s.
kiss assbehave in an obsequious or sycophantic way. North American vulgar slang
kiss assVulgar Slang
To act submissively or obsequiously in order to gain favor.