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?
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