Worse than a normal bitch, the stupid bitch has it's own specie classification, as it has a genetic structure and mental capacity inferior to that of a normal human being. You may recognize a stupid bitch by their irrational and selfish behavior. Though it is theoretically possible for a male to be a stupid bitch, there has been no such documented case.
Antonym: Decent Person
"What a stupid bitch!" in reference to the selfish or unintelligent actions of another.