Adjective describing a person who is overly confident in themselves. Often this confidence is completely false and the person has no real reason to be so confident in themselves. Results in great annoyance with the smug's friends, and also commonly the smug affects them, as smug originates from the nose dimple area.
Ashvin think's he's sooo cool, but he's just smug.
The smugness emitting from his nose dimples creates clouds and storms of smug around him!