Slang: Term used for "Mothafucka". Mostly used by niggaz (No offense to black people).
I met a MoFo playing GTA IV online. Met him on Halo 3. Met him on Saints Row. I couldnt stand anymore so i went to some hookers intown for calming me down. I met a bum with a X360. He was the MoFo i met. I went online and KILLD DAT MOFO.