Anything that makes a person happy. It can be an event, a person, a thing, etc.
"I had so much fun with my friends last night. It was so happy-making."
by Happy<3 January 18, 2008
When something causes one to become joyful, ecstatic, or just generally happy.
"I had some ice cream today! 'twas happymaking!"
by ldeken March 29, 2009