It Came From The Jersey Shores.

Come at me bro! Usually used by people who get angry easily and that refers to your enemy as your brother.  Originating from the hit reality show, "Jersey Shore", it defined as, "A phrase popularized by Ronnie from MTV's latest train wreck of a reality show, Jersey Shore."
The Example I find quite hilarious.
"Guy: (Begins taunting Ronnie)
Ronnie: Come at me bro!
Guy: (more taunting)
Ronnie: No dude, you come at me bro. Hold your girl back and come at me bro!
Guy: (even more taunting)
Ronnie: COME AT ME BRO, NO YOU COME AT ME BRO!!
(Conversation repeats consecutively for the next 5 minutes)
(a fight eventually erupts on the boardwalk)" Isn't that the funniest thing you read all day? Better that this stuff. It is used in arguments, usually on Twitter or Facebook(But is used by some people in real life, sadly). I guess it's unavoidable, unless people read this blog.