Doesn't have to be a man but it's someone who is being such a bitch you have to call them a man along with it. They are a person that pisses you off so bad that you have to call them something worse than a bitch. Some examples of a Manbitch are Fake
Captain America/John Walker(Marvel), Tom Koracick(Grey's Anatomy), Charlotte Watsford(H2O Just Add Water), Ebony Maw(Marvel), Chico(Deadly Class), the asteroid that killed the dinosaurs, Odin(Marvel), slugs(the actual insect), corners of tables, and
Taylor Swift(for always blaming the men in her life).
Some ALMOST Manbitchs are Thanos,
Voldemort, Maria(Deadly Class), seagulls, and pointe shoes.