Douche bag is the correct spelling of the term. A douche is used to clean a woman's vagina. A douche bag is a piece of equipment for douching - a bag for holding the fluid used in douching.
What Does Douche Bag Mean?
It is the definition of dalton
It is a bag shape object that can hold liquids as well as solids,females(some)use them to hold a solution used for internal cleaning of the vaginal area hope this helps you......
The other comment is correct- but sometimes rude people use it as a nasty name to call someone.