Broposing

To propose brohood (aka. holy brotimony) to the cool guy of your dreams. It takes a real man to go down on his knees for another dude.

Broposer: "Hey man, will you join me in the magically journey of mutual brohood?"
Broposee: "Dude, are you broposing?"
Broposer: "Yeah, man."
Broposee: "Cool."

The bros may now fistbump.