kiss someone's ass

Said because the ass is considered vulgar and being willing to kiss another's is considered a sign of submission and patronage.

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kiss someone's ass (third-person singular simple present kisses someone's ass, present participle kissing someone's ass, simple past and past participle kissed someone's ass)

1. (idiomatic, slang) To flatter someone (especially a superior) in an obsequious manner, and to support their every opinion to gain their favor.

   Synonyms: brownnose, kiss someone's ring, lick someone's ass; see also Thesaurus:suck up

• kiss ass

• asskisser
• asslicker