A human being who commits an atrocity such as stealing someone's life work and calling it their own. These douche bags tend to laugh at others misfortunes, or even worse, create the others misfortunes. It is often that douche bags steal from others that are not well known, but brilliant minds, who end up dying alone and talking to a laser beam pigeon in the mean time.
Edison: Hey, ah, Tesla, you're pretty smart, right?
Tesla: Yeah, I guess.
Edison: I'll pay you the equivalency of 1 million dollars if you fix my fucked up DC generators and motors.
Tesla agrees and does all of the work
Tesla: Done
Edison: HAHAHA TESLA YOU DON'T AMERICAN HUMOR YOU FOREIGN FUCK.
Tesla: .... douche bag.