(n). A word you use after a boring person texts you telling you about things you don't care to reply to thus pissing them off by only saying this. Mostly meaning "I DON'T CARE" But in a slightly nicer way. A great subject-changer!
Boring person: (After a profusely long story about things that don't concern you)
You Reply: Cool stuff man.
And change the subject.
You Reply: Cool stuff man.
And change the subject.
by RBSlover :) January 3, 2011
Get the Cool stuff manmug. a bid red lemonade glass with the drink "cool aid" in it he is there offical mascot and always says " OH YEAH!!!!!" he also likes to break through walls in conclusion (he is derpy)
by the bro, bro! May 23, 2017
Get the cool aid manmug. 
by HumanitysDying January 8, 2020
Get the Cool Waffle Manmug. when one acts harder in front of an audience different from their usual group of friends or acting differently in front of a girl rather than their usual self.
by J-smooooooove March 4, 2008
Get the man coolmug. when one acts harder in front of an audience different from their usual group of friends or acting differently in front of a girl rather than their usual self.
by J-smooooooove March 4, 2008
Get the man coolmug. A kein cool man is a cool guy and a good friend but gets mad when you take pictures of him or share them with class
by Randomguy392 March 31, 2021
Get the Kein cool manmug.