A person who intentionally takes the joy of another person and brutally murders it with no remorse.
Girl: Yesh, finally Full Metal Alchemist. Oh how I've longed for you. *kisses television*
Mom: No FULL METAL ALCHEMIST. Japan is evil.
Girl: Geez Mom, you're such a kill-joy!

Girl: Yesh, No school because of snow!
Weather Man: Looks like school is back in session due to the sudden elevation of tempurature.
Girl: Geez Mr. Meteorologist Man Guy, you're such a kill-joy.
by Buttonsinfallcolours August 09, 2006

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emo trash
''you see that emo kid?'' ''yeah, i heard they're a killjoy''
by glittergerard June 15, 2015

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Someone who is boring and thinks everything is weird and acts like the teenagers from "Hannah Montana".
Why do killjoys have to be so closed-minded? They need to get a grip!
by iLikeWatermeons33 November 25, 2012

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The group of fighters determined to take down BL/Ind. The most notable members of the group are
Party Poison
Fun Ghoul
Kobra Kid
and Jet Star
BL/Ind will take over the world unless the Killjoys stop them
by MCRBTRCSI April 14, 2011

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The name of people who are major fans or the band My Chemical Romance.
Killjoys, make some noise! :)
by Killjoy :) June 16, 2011

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Medal for the popular video game Halo 3. The Killjoy medal's purpose is to indicate when a player ends an opponent's spree, any spree of any kind. The symbol for the killjoy is a smilet with the "NO" symbol going through it.
When the medal is achieved, the announcer says "Killjoy"
"KILLJOY!"

Chris000 ended douchykinz's killing spree
by Chris000 January 14, 2008

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A strange phenomenon that occurs when a man sees an opportunity to lecture a woman in his life about why it's wrong to enjoy something she enjoys, whether it be silly laughter he doesn't understand among friends or a dessert or admiring her own beauty in the mirror. He has something negative to say because of his own inner turmoil, but he takes it out on the woman. He needs to feel like he's smarter and misery loves company.
This could also be true coming from a woman, or parent to child, child to parent, friend to friend or anyone to anyone. Sadly, I have had a lot of people try to be killjoys in my life, so I never try to be one toward others.
"Everytime I try to get laid, there is a killjoy."
"Calorie Cops are killjoys."
"Killjoys are sadistic."
"Everybody treats killjoys like crap. That's why they are the way they are."
by MadamexXx February 25, 2009

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