How did Douche Bag become the way to say moron?

There are so many ways to say Douche Bag, you can say D-Bag, Douche, D-Baggy, D-Bagish, Douche-ish, Douchebaggery and all I’m wondering is how a vaginal cleaning device became the nationally recognized way to call someone a moron or an arrogant schmuck?

I’m also wondering how many people actually know what a douche bag is and what they look like, I’ve never had the pleasure of using one myself and until I looked on google images tonight I had no idea what on earth they looked like or the exact uses as explained on wikipedia.

Douche usually refers to vaginal irrigation, the rinsing of the vagina, but it can also refer to the rinsing of any body cavity. A douche bag is a piece of equipment for douching—a bag for holding the fluid used in douching. To avoid transferring intestinal bacteria into the vagina, the same bag must not be used for an enema and a vaginal douche.

Now that I have found the picture I can now recall seeing these things many times, including my childhood bathroom, I guess I now know to keep away, very far away. I do, however, find it interesting that frum people tend to use the word a lot, since it’s technically not a swear word, but I guess they don’t know what it is.