Acronym for Young Adults Having Fun Association. This is not merely a club or organization, it is a way of life that is based on the philosophy: "We Do It For Laughs." It can be used to refer to the entire group as a noun or as an adjective describing an activity in which YAHFA would engage.
YAHFA, a very exclusive group, has such fun.
"Writing 'I Love Jan Rook' all over the place and eating copious amounts of ice cream was so YAHFA of you"