Top definition
Taken from the word happening. Can be used as a greeting, an exclamation of enjoyment, a form of asking the well-being of another person and a way of saying that everything is well.
Person1: Hello!
Person2: Happnin!

Person1: How're you?
Person2: Happnin man, you?

Person1: (e.g. whilst doing well in a game) HAPPNIN!

Person1: Happnin?
Person2: Happnin! You?
by KevHAHA May 07, 2007
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