This is from Heads You Lose by Lisa Lutz and David Hayward, in one of the chapters written by Hayward:
1. Oleaginous – Falsely or smugly earnest; unctuous
“The oleaginous red-headed detective from NYPD Blue and that forensics show was walking next to him, whispering.”
Now really, wouldn’t “smug” have worked just as well? And I wouldn’t have had to look it up!
Check out Bermuda Onion’s Weblog for more new words.