muj n. among (Anglophone) foreigners in Middle Eastern or Islamic nations, a guerrilla fighter or fighters. Editorial Note: Muj is used both in the singular and plural. Etymological Note: Clipped form of Persian and Arabic mujahideen, plural for mujahid ‘one who fights in a jihad or holy war.’ (source: Double-Tongued Dictionary)
This one was coined by the same people who use Bill for UBL (Usama Bin Laden) and AMZ for Zarqawi. I mean analysts who need an acronym for everything so the can keep it sorted in their tiny brains. It’s not that hard to tell middle easter names apart. Really.