You would not believe how many ways Max's DOS (Gallic intelligence service) and my Maquis have come up with to call each other bitches without actually using the word. It's beautiful to behold.
My GMG chars lump both Corsairs and Outcasts under the one term; Hispanics. It's a subtle yet significant insult to both.
I also call the Hogosha; Hogs (or "Batu")
With GMG and Rheinland relations no longer hostile, after a long period of no actual in-game hostilities between both factions as each kept their words and stayed on their side of the boder, we never developed a catchall term for them.
There is also Kabu - meaning turnip, for the Farmers Alliance (yet to see common usage).
and I heartily encourage others to call us Gas Miners "Akki" (Noxious smelling air)! "Gas Sniffer" just doesnt have the ring of a short, punchy Kusari word.
'Akki!' just sounds like something you would say when someone farts in an elevator...