A shortening for the term "motherfucker". Can be used as (1)a term of endearment, (2)casual reference, (3) term of reference for any given place or area. Also spelled as "mofo".
(1) That dude's one badass moh foh.
(2) That's the moh foh who cracked on that fuckin' piper that last week.
(3) I'm outta this moh foh.