1) The underappreciated apparatus of the Douche that actually does the stinky work. Attached to the Douche Bag.
2) A male who acts and looks like an utter jackass. Someone who transcends common insults to the point that simply calling him a "jackass" or "douchebag" will no longer do. Much more offensive than simply calling someone a douchebag.

Kayne West at the VMA's.

A douche nozzle is a person who can't handle social situations without his douche bag sidekicks. He bumps into you and speaks louder than normal because he thinks his douche nozzle presence is so important. Douche nozzles and bags travel together because they both must exist for douching to occur.

Someone that either gets on your nerves or is just a fucking bag of douche. You know that one person. He's even more of a douche than a douche bag, he's a douche nozzle. He has no idea that he's being an idiot and is not suave in any way.

The part of the douching apparatus that often is overlooked. It connects to the douche bag which collects the runoff. A nozzle is slightly more derogatory than the douche bag since the nozzle is the "business end" of the douche.

The phrase originated on the nationally syndicated radio show Loveline from C list celebrity Adam Corolla (also on comedy central, various shows)

Surpassing the level of a douche bag.

(adj.)- the next step up from being a douche bag, usually a nosy bastard.