mod. insincere and obsequious. : He's obnoxious but brazen rather than smarmy.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
Cite This Source
"ingratiating, unctuous," 1924, from smarm "to behave in a flattering way" (1920), variant of colloquial smalm, smawm (1847) "to smear, bedaub" (the hair, with pomade) of unknown origin.