bizarro world is a place where everything is inverted, backwards, or just not right but similar. For example in college (at a very large campus) I had a twin, my roommate had a twin and still my other roommate had a twin (not really twins just people that looked like us). They were our bizarro world counterparts who were occaisonally given rides, talked to or gone to lunch with by our friends. Once all of our bizarro world twins came to a party at our house.
Origin. BIZARRO WORLD. Incredible cube-shaped planet entirely populated by imperfect duplicates of familiar characters from the DC Universe.
Dude, I banged my friends bizarro world equivalent last night and thought it was her. Don't even know her name.