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Related to ass-kisser: sycophantic
rude slang A habitual flatterer or sycophant. That guy is always quick to help the boss with any little thing—what an ass-kisser!
n. a flatterer; an apple polisher; someone who would do absolutely anything to please someone. (Rude and derogatory.) Sally is such an ass-kisser. The teacher must have figured her out by now. The rest of the guys thought he was an ass-licker for what he told the boss.