A slang term having the meaning the same as one who has sexual relations with their mother. Often used by fat douchbags who paint their faces with feces, can't spell and follow ICP religiously. users of this word have been known to be ridiculed mercilessly on internet chatrooms, forcing payment of heretofore unpaid debts. See also, bodydamge
That mothfuckle told me he was going to kick my azz if I didn't pay him. Shoot, I used his money to buy vaseline and tickets to the Insane Clown Posse show.
When your out wasted and all the sudden you feel that urge to jump into the arms of another man and you faceplant on the concrete. After the faceplant you are a mothface.
Joe jumped into Matts arms, and Matts frail body couldn't hold him. Joe is now a mothface.