smarm (n.)youdaoicibaDictYouDict[smarm 词源字典]
1914, from colloquial verb smalm, smarm "to smear, bedaub" (the hair, with pomade), 1847, of unknown origin, perhaps somehow suggestive of the action. Verbal meaning "to smear with flattery" is from 1902.[smarm etymology, smarm origin, 英语词源]