Someone who is known for always saying or doing something that makes you just shake your head and glare at them like they are some kind of retard. Someone with very bad social skills.
When someone is beyond just a normal "douche" bag, they are actually the equal to a Nazi douche bag from the World War II era. This term is typically reserved for douche bags on the political scale.
1) the vile smelly mixture of water, yeast, cum, and whatever else that has been inserted in or living in the vagina that comes out after squirting water in a dirty, usually old, vagina or "duesching." The water is inserted from a bag and subsequently collected in the baag.
2) A guy who thinks he is cool but in reality is the equivalent of a bag of duesch.