An appropriate response to a story that is not believable without proof and no proof was provided.

Somewhat like Pics or it didn't happen.
Person A: I just got 15 headshots in a row when spraying with an M249 in Counter Strike Source without hacks!
Person B: Got a replay for this?
Person A: No, but I swear it happened!
Person B: cool story bro.
by gd1 December 1, 2009
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a troll's last resort, often used when the troll has no other defense to use
i like horror movies. no they suck. your movies suck. my movies kick ass. and my movies kick ass too. cool story bro
by chazm00 May 9, 2010
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A response to any of the comments made by Junaid Yasin, a brown senior at Parkway West High School because everything he says has completely no relevance to the current conversation. Cool Story Bro is also known as the "ultimate shutdown".
by coolstorybro123456 February 3, 2011
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A slang you say when someone is talking about shit you don't care about, it is unappealing to you and you feel like you are going to split into a freaking coma.

You tell the faggot in a sarcastic manner, "Cool Story Bro".
Hobo: I ORDERED 5KG OF CRACK FROM PIZZA HUT!
Troll: Cool Story Bro.
by SaviourZealot October 6, 2011
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A catchphrase used when a person says something complETEly unrelated to the topic you were just talking about.
John: "So I just got Modern Warfare 2 yesterday."

Dave: "Yeah? Do you like it?"

John: "Holy crap, it's the sickest game ever!"

Paul: (butting in) "Did you know dogs can lick their private parts?"

John & Dave, simultaneously: "Cool story, bro."
by G0dS4v3T3hCZ4RX February 3, 2010
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A suitable way to articulate your lack of interest in a male after he forcibly thrusts his erection in the direction of your butthole whilst spooning with him; also an appropriate response to a photograph of a boner sent via text or E-mail.

An adaption of the infamous cool story bro
Chess: Yeah so I was totes spooning with Seth last night, and he kept pushing his boner into my ass. I was like cool boner bro.

Anke: Dude, I said that when Jack told me he was hard.
by LightningC0bra October 27, 2011
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A phrase used toward someone if you don't really care what they are saying, or your just joking around trying to annoy them.
by your a yickkkkkk July 22, 2013
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