son of a bitch
(but becoming more and more acceptable, especially if said with a positive or loving intonation).
Fellow, character, guy, individual.
Negatively:
Get out of here you filthy, miserable sunuvabitch!
Positively:
So you won ten million dollars at the lottery, you lucky son of a bitch (or sunuvabitch)!
Compare: SON OF A GUN.
Categories:
Source: A Dictionary of American Idioms