happen

/ˈhæpən/ Show Spelled Pronunciation hap-uhn
–verb (used without object)

to ejaculate; to cum;jizz.

the verb in the idiom "something to happen (to a person)"

meaning "(of a person) to experience death or some other misfortune; a euphemism"

For something to become real, typically an event. Often used in phrases of the form "What happened to (noun phrase)?", or "Would you happen to know (something)?"

(Alkaloid slang) vi. 1. to do life as a performance piece. 2. to collaborate artistically or spend social time. 3. to be romantically involved with. n. 1. a performance, party or other event

It's a more socially acceptable version of "shit happens".
It can be used to:
1)express condolences for someone's situation without offering any apologetic words.
2)respond to a future problems that shows a sense of sadness/aggression towards it, but in a way without trying to complain
3)to shrug off a one's own, or someone else's, minor annoyance
4)substitute for an actual response, while still continuing the conversation

Phrase said after something strange or weird has occurred in your presence

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.