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Cool Killer 

A title given to a person who makes a previously cool thing uncool, including things like music, websites and blogs. People could include parents, stupid famous people, and advertisers.
"Why haven't you been on Twitter lately?"
"You didn't see? Barbra Walters made an account and talked all about how cool it was on the news."
"Wow. What a cool killer."
"Totally."

"I went to a party, and some cool killer just starting giving this gay speech about global warming. We all just got up and left."
"Haha, what a fag."
Cool Killer by OmgAsnowmaine April 14, 2009
Related Words

wolf conkiller 

Loves to get Rusty Trombones from guys, his mothers a crusty ass milf, but a dab of KY will fix that, he is of afrinigger desent and attends elementry school.
Wow. I never thought conner could be such a Wolf conkiller!
wolf conkiller by AtR Wafflebaker November 10, 2010
Coolville describes the sheer beyond greatness of something, that awesometown doesn't have, on a larger scale. Coolville trumps awesometown in every aspect of its awesomeness.
The burrito is even more coolville than it is awesometown.
Coolville by J-dubs532 January 10, 2010
Wow, that watch is so coolville!
coolville by Seanthebeloved January 22, 2011

codekiller

This is my definition of code killer from hackerone
I am codekiller who hunts bugs and reports them securely.
codekiller by bugh96349 February 9, 2023