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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.
by FedoraBrow January 11, 2011