/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

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

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

1. an event, band, person or anything that is not cool, interesting, or attractive. usually used to give a negative recommendation about something