Define Cool Story, Bro Meaning

A phrase sarcastically used to indicate one's disgust or indifference towards a tl;dr story.

An appropriate response to a story that went nowhere and/or was completely uninteresting.

Phrase used sarcastically to express a lack of interest in what the other person is saying. Often written on the Internet as, "cool story bro".

A response to a story or piece of information that you find boring, or is too long and you don't want to read it.
One extra note, though. The only proper use of "Cool story, bro" is to say it exactly as it is in the quotes. Any other variation ("Interesting tale, brethren", "Wonderful retelling, sibling") should never be used under any circumstances, and will make you look like a complete failure to everyone who reads it.

A sarcastic way of acting like you give a shit of what the other person has to say. Usually this phrase best pertains to Facebook updates and mundane stories with pretty much no point or purpose.

4chan saying commonly used when sayer is listening to someone talk to him and doesn't really care

A way of saying "I don't care what you're saying but I'm gonna go ahead and say I liked the story."

Usually used after listening to a long story or gossip.

When someone tells you something and you simply don't care.

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.

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.