Definition 1 of 1
Coalition refers to the collection of parties agreeing to run the government as a team.
Dharma is duty, in Sanskrit.
The term is of recent coinage, and has been in use rather frequently. Major political decisions by ruling coalition parties revolve around a series of deals between members. A lot of the time, significantly poor decisions are attributed to the vagaries and impulses of petulant partners.
The Dharma in question has an air or irony attached to it.