Definition of bitch:
"my bitch just had puppies: they're so sweet!"
(with about) To make derogatory
comments about (a person) without the person's knowledge; (with about) To criticize (something) spitefully, often for the sake of complaining rather than in order to have the problem corrected
"look, I saw you bitching about me yesterday, I know how you feel: why can't you say it to my face?"