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20.
A declaration that one is not interested in the topic at hand but that one does not have the proper IQ to come up with a more interesting topic.
Amelia: My grandfather died

Zeus: Cool story bro
by Rihanyce May 23, 2010
 
1.
A phrase sarcastically used to indicate one's disgust or indifference towards a tl;dr story.
Person A: (lengthy tale about how Person A tragically broke up with his/her mate the other day)

Person B: cool story bro
by a1b2c3d4e5 January 05, 2009
 
2.
An appropriate response to a story that went nowhere and/or was completely uninteresting.
"This one time me and my brother were eating sandwiches and he was like 'dude, I hate mustard' and I was like 'yeah.'"
"Cool story bro."
by Geneva H February 07, 2009
 
3.
4chan saying commonly used when sayer is listening to someone talk to him and doesn't really care
1. so this one time we were sledding down a hill and we totally got broke
2. Cool Story Bro
by Biohazard357 March 27, 2009
 
4.
Cool story, bro is the ultimate shut down to faggotry, obvious trolling, and tl;dr infecting the internets, to which there is no response
Troll: "Halo invented the FPS video game genre!"

Other Guy: "Cool Story Bro"
by Anonymous Is Legion. October 25, 2010
 
5.
The most suitable response one can give to a story that completely wasted ones precious time. Parents, co-workers, and history classes often provoke its usage.
Bobby: So guess what? Nina wrote me up again, because i came to work late the other day.

Kelly: Cool story bro.

*FML why does Bobby think i give two shits about his life??? Please lord have this shift end already! He makes my job REAL RUDE*

Teacher: Agriculture was key to economic progress in the early ages.

Student (shouting): COOL STORY BRO!

Mom: When i was your age i always had my room spotless.

Son: Cool story bro.
by RudeApproved March 09, 2011
 
6.
A phrase used to express indifference or boredom to a long or boring conversation.

There are many different types of "cool story bro". There is:

1) cool story bro
2) cool story bro, you should write a book about it
3) cool story bro, in which chapter do you shut the f*ck up?

etc.
1) Chad: I ate an apple for breakfast

Angie: Cool story bro.

2) Hannah: And then I rinsed my teeth. And then, lo and behold, I saw a black mark. I thought: "Hmm, what can it be?" and hark! It was a cavity! So then, I --

Josie: Cool story bro, you should write a book about it.

3) Tad: boring and lengthy story about scientists growing a new type of capsicum

Beth: Cool story bro, in which chapter do you shut the f*ck up?
by NaziCookieMonster June 24, 2011
 
7.
Coolstorybro is most commonly said by 12 year old faggots.

It used to be used on the image board 4chan as a reply to a long, descriptive post.

But now the phrase has been spread around the internets by stupid fucking kids who are trying to be cool.

If you see someone typing this, flame them immediately.
Jim: Hi

Faggot: Coolstorybro

Jim: Oh, so you're copying off the other kids now..

Faggot: Coolstory

Jim: Fucking idiot.
by Vope February 28, 2011