This is someone along the lines of a douchbag but they are worse. If someone is a douchbag and then some, then they are a douchnozzle.
Look at that douchnozzle over there he is so drunk he thinks the tree he is talking to is a person.
A douchnozzle is an individual who is less than, or lower than, a douchbag. These individuals cannot be compared to the entire apparatus, but can only be reasonably compared to the business end of the device: The greasy, nasty little tip.
Look at that douchnozzle riding that scooter wearing those faggy-looking red, white and blue fingerless gloves! Rock on EASY RIDER!
Also, virtually all males seen driving convertibles with the top down and the windows up are douchnozzles.
Another example of a douchnozzle is anybody with a Batman tattoo.