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.
1) "Check out the cell phone clip on that Douche Nozzle".
2) "Can you believe that Douche Nozzle? He's walking around the party, talking to fat chicks and searching for an 'Insert Here' sign".
3) Oliver from Spring Break.
A person (typically male) or their actions, who has acted in such an obnoxious manner that the behavior alone reeks as an unsanitary twat would. Malicious intent and/or malevolence is a general added characteristic.
The most vile form of Douche-Baggery. In progression of severity of behavior: One could be a Douche, a Douche-Bag, Douche-Nozzle, or most disgustingly Douche-Nozzle Backflow!
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.
That douche nozzle Rob showed up again with a bunch of douche bags. They douched around for a while and thenfucked off together.