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A person who emitts a great aura of coolness.

Sometimes "funking" may be used to emphasise the coolness.
"What a funking coolster you are!"
coolster by Greg the coolster November 11, 2006

coolstar 

weeb ass jailbreak developer known as pornstar who develops his crappy sileo that nobody uses and competes with pwn2ass
coolstar: send anime
pwn20wnd: fucking die in fire weeb
coolstar by fries hahahah lol xd September 21, 2019
When you jerk your homie in subzero temperatures
In Alaska, my man Calvin gave me a coolster
Coolster by Joe Ivy June 13, 2019

coolstonks 

coolstonks is a primarily Minecraft youtuber who makes great videos and has a cute voice
coolstonks is a great youtuber.

coolstorybro 

Coolstorybro is most commonly said by 12 year old faggots.

It used to be used on the image board 4chan as a reply to a long, descriptive post.

But now the phrase has been spread around the internets by stupid fucking kids who are trying to be cool.

If you see someone typing this, flame them immediately.
Jim: Hi

Faggot: Coolstorybro

Jim: Oh, so you're copying off the other kids now..

Faggot: Coolstory

Jim: Fucking idiot.
coolstorybro by Vope March 14, 2011

CoolStar 

CoolStar by JbAin May 7, 2020