Someone who always has an answer for everything and then puts on a 'told you so' face after proving their point in nearly all situations.
Husband "Can we move the boiler up to the loft so we can start renovations downstairs?"
Wife "No!"
Husband "My workmate Myles did it and said its the best way to do things"
Wife "Bet that Smug Bastard has a huge loft to walk around too!"
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.