A Gancanagh is a male faerie in Irish mythology that is known for seducing human women.
The Gancanagh are thought to have an addictive toxin in their skin that make the humans they seduce literally addicted to them. The women seduced by this type of faerie typically die from the withdrawal, pining away for the Ganacanagh's love or fighting to the death for his love.
The Gancanagh was addicted to seducing mortal women, which eventually lead to the women's death.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.