Darn, I looked too and the best web reference I found isn't listed. Metfarts are when you are taking the drug Metformin and some carbs. As it was explained to me the Metformin slows down the absorption of the carbs, I think they fester a little down there and become smellier with too much protein. I'm no Dr. but results speak for them selves.
I splurged once and ate several pieces of pizza then went to play ball hockey with the boys and I cleared out the whole gym. They stopped the game and aired it out. I thought it was funny.... apparently I was the only one...