son of a bitch

son of a bitch or sunuvabitch also S.O.B.  {n. phr.},  {vulgar},  {avoidable}

(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.