calm down killer 

an expression used in america by young adults. Meaning dont freak out, relax, or simmer down.

"WTF???"- "calm down killer, its not that big of a deal"-Amy

calm down killer by hahahhthisprovesmypointtaber December 10, 2009

Gossip Girl, Psycho Killer 

The book written by the author of the Gossip Girl series as a mashup, in which the two main characters, Serena and Blair become serial killers and kill everyone they hate in Manhattan, trying to keep blood away from their brand new Prada bags or YSLs.

Girl : OMG, Gossip Girl, Psycho Killer is so great!
Other Girl: My favorite part is when Serena kills the guy that didn't wanna pour her a Martini for being underage!
Girl: Too bad her Gucci got dirty!
Other Girl: Tots.

Gossip Girl, Psycho Killer by Hey It's Me, So How's It Going July 25, 2011

government created killer nanorobot infection 

a serious epidemic which is now known as GCKNI (Government Created Killer Nanorobot Infection)

Can be spotted by the little red marks all over their bodies resembling freckles.

Those poor people who were involved in the outbreak of GCKNI (Government Created Killer Nanorobot Infection) will never be the same.

government created killer nanorobot infection by Edward Lavender June 21, 2007

Contract Killer

an assassion for hire. paid to kill, and not leave a trace of evidence that can lead back to the customer.

I'm a contract killer, for my last hit i was paid $60K.

Contract Killer by Ric0 September 14, 2007

nigger killer 

Slang term for Newport Cigarettes as they are notorious for being smoked by the black population.

Weston: Can I have some some alcohol?
Negroid: ay yea mane
Weston: Thanks.
*groid goes in, buys nigger killers instead of alcohol*
Weston: Thanks.

nigger killer by toomuchsugarjoey October 15, 2019

Team killer 

A person who, through accidental methods or with intent to do so, kills most or all of their team, may happen repeatedly. Abbreviated as a "TK'er"

N00b: *Grenades his whole team*
players 1-4: DUDE, STOP TK'ING!

Team killer by Shockcannon May 13, 2005

Comment-Killer

When someone non-popular or not even in the picture comments on it. Ending all comments for the picture. Comment-Killers could be: Creepers, weirdos, non-talkative people that just talk on facebook, or old people.

There were 19 comments on that pic until Dale posted the Comment-Killer.

Comment-Killer by Dierks Olgensen April 30, 2010