A phrase not unlike "that's what she said." However it is said after someone says something rude and another person says it in an insulting manner.
Carrie: "And next time, bring out the salad before the main course!!!"
Terri: "Said the bitch!"
verse from Cardi B's new song Bodak yellow..
A : said lil bitch...
B: YOU CANT FUCK WITH ME IF YOU WANTED TO !!!!!!