Definition of smug:
adjective
Exhibiting or feeling great or offensive satisfaction with oneself or with one's situation; self-righteously complacent.
"a smug look; a smug critic."
[irrelevant]
Irritatingly pleased with oneself; self-satisfied.
The American Heritage® Dictionary of the English Language, 5th Edition • More at Wordnik
Classic example of smugness (from the Voltaire's Candide):
Pangloss was professor of metaphysico-theologico-cosmolo-nigology. He proved admirably that there is no effect without a cause, and that, in this best of all possible worlds, the Baron's castle was the most magnificent of castles, and his lady the best of all possible Baronesses.
"It is demonstrable," said he, "that things cannot be otherwise than as they are; for all being created for an end, all is necessarily for the best end. Observe, that the nose has been formed to bear spectacles—thus we have spectacles. Legs are visibly designed for stockings—and we have stockings. Stones were made to be hewn, and to construct castles—therefore my lord has a magnificent castle; for the greatest baron in the province ought to be the best lodged. Pigs were made to be eaten—therefore we eat pork all the year round. Consequently they who assert that all is well have said a foolish thing, they should have said all is for the best."
Today's smugees (my coinage) evidently want this world (or the Western part of it, at least) to be all for the best. To that end, they (and their predecessors) have been busy for decades (more than a century, actually) laying the groundwork for the new dispensation that is rapidly overtaking (and supplanting) the traditional liberties and social norms that are obstacles to their vision of nirvana.
What is that vision and what are its dire consequences? Rather than repeat myself, I urge you to read "What Happened to America?".