What's up bro?Usually it is a male's informal way of greeting a close male friend. "What's up?" means "What's going on?" and "Bro" is short form for "Brother".|It's just a phrase for saying hi. Like, "hey how are you? ", "how are you doing?", "what's up?". Usually it's used toward a male because of the "bro" which is short for brother.|it's a greeting usually used by young people. it's a ... More @Wikipedia
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