hereby request your assistance in liberating myself from being ignorant. How?

Well, I see all of this talk about the BE Civil War (which my Vulcan logic tells me means Bloody Elbow) I, II, and maybe XVL. So, uhm, what exactly is the BE Civil War? And how can I, Ignoramus, get into the fight?

Second: I see this chant and seeming battlecry: Let's Mootherfukers or sumfing to that effect. How did this blood lust cry originate? When is an appropriate use? How can I use it effectively?

OK, so I am bored at work, but c'mon. Help a semi-lurker ignoramus out!!