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Noun; A person who is a complete buzzkill, has no trust in anyone, and goes out of his or her way to ruin an event in which he or she is unhappy with.
Wow she ruined our party because she was going to be out of town. What a Killday!
Killday by BushLover10 July 21, 2011
Related Words

Killgasm 

Getting "over-excited" after a large killing spree or an epic multi-kill.
"Reaver got a killgasm for getting three consecutive kills."

"Jones experienced a large killgasm for his monster kill in Unreal Tournament 2004."
Killgasm by Chapst1ck April 5, 2007

Killgasm 

Getting a kill streak of 20 in any online first person shooter match that causes a sensation to surge the body and make you dominate even more.
"Dude that was fucking awesome I just got a killgasm."
Killgasm by MIDKNIGHT22 January 21, 2009
Derogatory term for Calgary. Obviously named by an Edmontonian, just to get back at Calgary for being named Deadmonton.
Person1: Why is it Deadmonton?
Person2: Ask Killgary.
Person1: What? Why?
Person2: Cause they did it. Pure Homocide.
Killgary by GotchaSmile November 13, 2010
Long hallway or confined space where a shooter would have ease taking out the person/people in the killway.
"
"Dont stand in that killway!"
killway by jaqk August 8, 2019