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not cool man 

when someone does something that is not acceptable, "Not cool man!" is usually an appropriate phrase to inform them that what they did was not nice, cool, funny, or tolerated by society, or just you.
Uncool guy: My butt is so awesome....
Cool guy: Not cool man!

Not Cool Bro!! 

The phrase of choice of a very loud Armenian male population, especially from Glendale, CA when they disapprove of anything not to thier satisfaction. Normally said in a very loud, booming voice with a rolling 'rrr'. This phrase is used mostly in driving situations where the all too perfect Armenian driving style has been disrupted in some way.
Shouting from his driver' side window - "Hey BRO! Not Cool Bro! Why you make lane change my lane when you KNOW I coming BRO!?? NOT COOL BRO!!".

not cool robert frost 

An expression of mild exasperation or frustration - may be used as a substitute for a curse word at work or in front of children. (Inspired by the first Kid President pep talk).
Roomie #1: Where's the rest of the cake from last night? I was planning to have it for breakfast...

Roomie #2: I ate it after you went to bed...sorry.

Roomie #1: Not cool Robert Frost!

Not cool man 

a phrase to express deep disapproval, coined by F block H Pre Algebra
That 4.1 and 4.2 test? not cool man.
Not cool man by Qwerty keybord April 10, 2021

you're not cool 

a useful phrase that comes in handy when some dumbass does something 'cool'.
but really. it's stupid.
you're not cool.
actually. you're about as cool as this definition.
that makes sense.
you're not cool by sammy____ September 13, 2006

NCFS - Not Cool For School 

Derived from NSFW - Not Safe For Work.
Instead of sitting at your work desk, you are sitting at the school library when opening a mail, link, picture, video etc. from a friend with explicit content. Either he warns you NCFS - Not Cool For School, or you ask him.