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!

by Shiraz rocks mannnn February 3, 2018

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.

by Qwerty keybord April 10, 2021

Hey man that’s not cool

What you say when you get caught in 4K kissing your waifu on a pillow

*shines a flashlight*
Sandals: *kissing a pillow* hey man that’s not cool

by JDMF April 14, 2024