Similar to the phrase cool story bro. cool story 9000 bro is said to add emphasis on how much you don't care.
Hipster Harry: I listen to bands that don't even exist yet.
Cole: COOL STORY 9000 BRO
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A saying said to someone when you don't give a shit about the story they just told.
Person One: "(Tells extremely lengthy anecdote about his grandma knitting him a sweater)"
Person Two: Cool bro, story
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a sarcastic way to get some one to understand their own stupidity in what they just said
"SOoo i went shopping with my mom yesterday.......etc"
"cool story bro, now what chapter do you shut the fuck up?"
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Not listening and doesn't care if comes off rude
Friend: Yea so yesterday i went on this really awesome travel and it was so cool
Bored Person : Cool story Bro