Deriving from the use of the slang word "brozz" (singular "brozzle") for a persons "bro's", the phrase "brozzle nozzle" is a reference to the male member. Obvious as it looks, it is the nozzle, scientific term penis, on any particular brozzle, scientific term male, so to speak.
Example 1-
Person A-Can someone please explain a belt-tuck to that guy?
Person B-I know dude, his brozzle nozzle is raging out of control!
Example 2-
He better watch out mowing the lawn without pants-might get his brozzle nozzle caught in the blades...
A Bro of such magnitude, the izzle practically writes itself in
Person 1: What's up Brozzle
Person 2: Slaying
Person 1: Thought so