Dip in it anywhere and there's a gem... Take Browning's instructions on 'How to be SMUG':
Certain clothes are an outward and visible sign of an inward and invisible smugness. For example, polo-neck jumpers are virtually the uniform of the smug. It's a way of saying to people, "I'm rather cosy."
The word smug is basically an elision of smiling and snug...
Smugness, like ragwort, is incredibly difficult to get rid of once it has taken root.
The hot bath of achievement may have long disappeared down the plughole of life but the scum line of smugness will last until it's scoured off by the brillo of ridicule.