a term used by Jason Mraz and friends to describe someone whose main purpose or job is to bring joy to others.
"Calling her {Tricia} our 'Joyologist' is the way we
acknowledge her for the
extraordinary job she’s created. Her
knowledge of the road, raw food, and rowdy men, partnered with the practice of yoga and patience empowers her to bring so much peace, love, and joy to everyone in our touring community and the extended families (including you) affected by our travels." (from Jason Mraz's blog)