It is short for motherfu**er.
fas-mo-fo-be-a
mr mo fo
Indeed, its true.
fo mo go lo
hell ya mo fo
sommert that can kill you mo fo !! :D
It means Mother F-word-er
Cuz he's a gay mo fo :P
oh you dont even know mo fo!
18th August i think mo fo
it means great beautiful one ! XD
798 dude, patience is a virtue mo fo.