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When a person makes a mistake or does something embarrassing and attempts to justify it by saying only cool people do it.
Example 1:
Man 1: "I cried when I watched Titanic."
Man 2: "You're a pussy."
Man 1: "Hey, only real men cry during Titanic!"
Man 1: "You're just trying to Coolstify yourself."

Example 2:
Man 1: "I just sucked that guy's dick."
Man 2: "Dude, that's gay!"
Man 1: "Only cool guys suck other guy's dicks."
Man 2: "No, you're gay."
Coolstify by Sembree January 23, 2013
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

Coolest kid

Coolest kid could be anyone.
You wouldn’t know who.
LAME Kid1: Hey, who’s the coolest kid around here?
LAME Kid2: Only the one and only Coolkid89!
LAME Kid3: WOW! Their name even sounds cool!
Coolest kid by Not Niki December 8, 2021
the most "cool" or the "best"
"man, that car is like the coolest thing I've ever seen!"
coolest by Will L June 22, 2005

fucking coolest person ever 

Stephen Colbert is the fucking coolest person ever.
fucking coolest person ever by K3n7 September 9, 2008

Coolest cat in the Barn

The act of being extremly cool and amazing, yet resembling the awsomeness of cool barn cats.
Amanda: WOW, My pet fish is SO cool!

Hayley: You bet, it is the coolest cat in the barn!