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1. slang Short for "brother," used primarily to refer to one's friend. The term likely originates in African-American Vernacular English. What's up, bruh? You good?
2. slang Used as an exclamation of shock, surprise, or disbelief. A: "They fired me this afternoon." B: "Bruh, for real?" Bruh! That is some messed up stuff.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.