person 1: hey dude, have you checked billie's instagram lately?
person 2: yeah, I just did. she has just announced her second album called "Happier Than Ever"
Modern hippy hipster types who actually accomplish tasks of great magnitude and worth. A happener, much like our modern definition of a hipster, does have certain interests in counter culture lifestyle and the various accouterments that go along with such. The marked difference between a hipster (being frankly the modern version of the hippie or renaissance person), is that happeners are always involved in some great events. Happeners are the hero's of the universe. May statues be built in their honor.
Did you see how intensely that woman back there was involved with her artwork, she was a total happener.
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...