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The obnoxious look on the face of one who beleives that his/her shit does not stink. Also known as a "shit eating grin."
"How dare you stand there with that smug mug, while the stench of your flatulence makes my eyes tear up!"
smug mug by Michael Vincent March 12, 2009
Related Words

Snugmuggle 

To sneak contraband into a jail facility using a body cavity
That inmate tried to snugmuggle dope.
Snugmuggle by I.M. Norty September 13, 2018
The action of collecing sweat on the pawn of the hand from a person's crotch. After collecting the sweat then wiping it in their partner's face.
Thats quite a smug mug you got.
smug mug by zacher November 16, 2006
Someone who has a really big lips that are not proportional to the face, and look like slugs
man, she is a real slugmug
Slugmug by alfiena September 3, 2005
i was getting pounded by that guy last night like a mallard duck he made me make smugmu all over
smugmu by alejandro gonads March 25, 2008
1. The Smuggest person in the world.
Eric, why can't you be more like SmugNug? He makes me so Hot!
-Aunty Springsted
SmugNug by C-Monster February 29, 2004