The fictitious and nondescript effect of too much smug in the atmosphere. Smug is caused by humans who, among other things, love the smell of their own farts because they drive hybrid cars.
Coined in South park when Kyle's dad thinks he is ahead of the curb than the other residents of south park because he buys a Hybrid.
Guy: Stop acting like such a smug bastard just because you own a hybrid car.
Hybrid Owner: Unlike you I'm trying to protect the earth rather than destroy it. *Smells his own fart*
Guy: That couldn't be further from the truth, global laming is far worse that global warming.