noun, plural bros. Slang.
a male friend or buddy.
a guy or fellow: used as a term of address.
a fellow black male; soul brother.
a young, usually white male variously and often negatively characterized as being preppy, party-loving, egotistical, sexist, etc.
of or pertaining to bros: the bro culture of college athletics.
Origin: 1830–40; Related forms
reduced form of brother