According to The Bro Code

While Bros are always encouraged to spread the truth of The Bro Code, they are also cautioned against overusing "Bro". Such Broliferation cheapens the important mission of this boom and, nearly as important, makes you sound stupid.

Appropriate "Bro" Usage           Nabrolean Tom Brokaw Bro Jackson Teddy Broosevelt Broce Springsteen

Inappropriate "Bro&" Usage Broan of Arc Brovara Walters Bro J. Simpson Geraldine Ferrarbro Broko Ono

http://www.thebrocode.co.uk/brocabulary.cgi