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1.
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"
by YAHFA May 12, 2005