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.
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
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".
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.
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."
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.
A phrase used toward someone if you don't really care what they are saying, or your just joking around trying to annoy them.
"Yo I just got some new kicks", You: Cool story bro, tell it again?!