While there isn't a single definitive organization known as "Mbs Farm 4 Play," the phrase appears to combine elements from local planning and competitive gaming.
"After trying half a dozen map mods, I keep coming back to Play 013. The 16 revision fixed the silo loading bug that annoyed me for months. It's not flashy, but it just works." — FarmSimVeteran, Forum Post Mbs Farm 4 Play 013 16