OK, you're probably confused as to what M.F.K.R. is, but you probably already know it's something to do with Slipknot. Basically, it was Slipknot's very first recorded content, a demo. It stands for "Mate. Feed. Kill. Repeat." It was released in 1996 and there were only 1,000 copies made. The band members at the time were different to the members now (2009). Slipknot considers M.F.K.R as a demo, and that the band has evolved greatly since they recorded it.
Abbrevation for "Det Klikker For Meg", which meanssomething like "I am snapping" or "I can`t take it" in norwegian. Normally used in a stressfull situation.
"hey how are you"
me: "well.... i.w.t.k.m.s.s.b.b.i.d.w.t.m.m.f.a.f.s"
"what?"
me: "i want to kill myself so badly but i dont want to make my friends and family sad"
"get some therapy my dude"