Coined by John "Cakes" Auville of the WHFS Sports Junkies. Cakes wanted a home that would not be damaged by termites. Specifically, he expressed a wish for a "money metal house." Originally, "money" (meaning awesome, tight, etc.) modified "metal house," (i.e., a house not made of wood), but now "money metal" is an adjective of its own, and does not require the object it is describing to be made of metal.
"I'm wearing my money metal Dr. Jthrowback."
"That ref made a money metal call."