Background: Coming from the fact that a pig is generally happier in it's own environment - it's own faeces (Makes tastier and tenderer Bacon and Sausages...)
Def: Where one person is extremely happy in the environment they find themselves in
Parachuting into the Playboy hot-tub and finding that their Sun-tan lotion boy is off for the day and they need a new one to oil them up... Expression comes into play when the job is at least 5 mins underway...
Most male dogs are happy to be able to lick their own dick. Imagine how happy the dog would be with two dicks and be able to lick them both! Man, he's a happy guy.
That sonuvabitch must have just humpped the neighbor's cat. Look at the silly fucker, he's happier than a dog with two dicks.