Why is most teenager say cool story bro?

It's been more than a year but I still don't get why people keep saying that. It's everywhere like the Internet, t-shirts and even iPhone case. What's the reason? Who started it?

I don't know but its the most annoying phrase ever along with "YOUR MOM"…

Reason: See "Just gave you the best answer's" response to your question.

One would generally reply with: "Cool story, bro."

Non-linear, off subject comments are fully deserving of that phrase. Go ahead, try it. Feels good, I promise.

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