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.
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Word Origin & History
smarmy
"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.