(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.
by RBSlover :) January 3, 2011
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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)
peep 1 " he cool aid man are you a creepy ass fucker?"
cool aid man "oh yeaaah
by the bro, bro! May 23, 2017
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wow cool beans man!!!!!!!
by rex113 April 11, 2017
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Cool waffle man is a criminal cause burning down pancake factory and caught stealing waffle irons
Cool waffle man: "cool waffle man is a criminal, if found call 911 immediately"
by HumanitysDying January 8, 2020
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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.
a soft ass guy: GET THE FUCK OFF ME *threatens to punch*
friend: stop acting man cool.
by J-smooooooove March 4, 2008
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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.
a soft ass guy: GET THE FUCK OFF ME *threatens to punch*
friend: stop acting man cool.
by J-smooooooove March 4, 2008
Get the man cool mug.