Someone who is such a douche that their personality and physical appearance resembles that of Frankenstein. They also frequently go to McDonalds.
Jim: Let's go to Dairy Queen.
Bob: I want McDonalds
Jim: Why?
Bob: Ahh Ennh must kill and eat McDonalds!
Jim: You're a McDouchenstein.
Bob: I want McDonalds
Jim: Why?
Bob: Ahh Ennh must kill and eat McDonalds!
Jim: You're a McDouchenstein.
by Caleb S. September 3, 2008