Bro

brother.
a male friend or buddy.
a guy or fellow: used as a term of address.
a fellow black male; soul brother.
Also, bruh [bruh] /brʌ/ (Show IPA), brah [brah] /brɑ/ (Show IPA). a young, usually white male variously and often negatively characterized as being preppy, party-loving, egotistical, sexist, etc.
of or relating to bros:
the bro culture of college athletics.
brother.
Contemporary Examples

Louis C.K. on Daniel Tosh’s Rape Joke: Are Comedy and Feminism Enemies? Jennifer L. Pozner July 17, 2012
Justin Bieber’s Bad Bromance Chris Lee August 28, 2012
How ‘The Mindy Project’ Star Adam Pally Became Hollywood’s Go-To ‘Bro’ Kevin Fallon August 5, 2014
How ‘The Mindy Project’ Star Adam Pally Became Hollywood’s Go-To ‘Bro’ Kevin Fallon August 5, 2014
Hillbilly Heaven: The History of Small-Batch Bourbon Dane Huckelbridge March 28, 2014

Historical Examples

John Gayther’s Garden and the Stories Told Therein Frank R. Stockton
Birth of a Reformation Andrew Byers
Birth of a Reformation Andrew Byers
Birth of a Reformation Andrew Byers
Personal Recollections of Pardee Butler Pardee Butler

noun
(NZ) a family member
a close associate
noun
(South African, informal) a friend, often used in direct address
abbreviation
brother
n.

Brother (mid-1600s+)
A black person: the slick-speaking bro who scores points off the ofay (1960s+ Black)
A man; guy: the pack of twenty-seven bros jamming along the freeway/ Hawk murmured, ”Right on, bro,” and drank some champagne (1970s+)

[soul] brother
brother