Monty Haul, adj., D&Dism 1. "A campaign (or the DM running it) in which greatly excessive amounts of treasure and/or experience are given out." -- from the original Advanced Dungeons & Dragons Dungeon Master's Guide, p. 229.
2. descriptive of a game or GM that is friendly to power gamers. See Santa Claus. [GJ1]
Addendum: This is a pun on the name Monty Hall, the host of television's "Let's Make A Deal" from 1963-76, in 1980, and from 1984-85. [GJ1]