Spiritual (or pseudospiritual?) guru who attends to the inexpressible needs of the multitude, in return for lots and lots of cash. A pun on "car mechanic", from an early Genesis song, "The Battle of Epping Forest", from the album Selling England by the Pound (1973). Think Rajneesh, Jim Jones, L. Ron Hubbard, or any of a host of others.
He employed me as a karmamechanic/ with overall charms/ his hands were then fit to receive/ recieve alms ...,
- Genesis, "The Battle of Epping Forest"