People who are douche bags and have to ruin the fun of everything, kill the mood or shoot everything down.
Jamie: "Naw, I think I'm going to skip out on the concert, chillin' with friends and going camping."
Caitlin: "Jamie you're such a fuckin' kill joy!"
by Caitlin July 2, 2005
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Peepz who kill the fun by wanting to do something else or calling it a day/night too early (like me).
"Ay I gotta go. I gottta see my friend so...just watch the rest of GLADIATOR without me, aightz?"

"You're such a KILL JOY!"
by Joshiro007 February 24, 2003
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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 9, 2006
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This is a nickname given to someone who is cynical, hates fun, and hates it when other people have fun. Originally derived from the stereotypical view of an angry grandmother who thinks her grandkids shouldn't be allowed to play and have fun.
Don't be such a Grandma Kill Joy, come to the party! It will be fun!
by Jackie | Treehorn December 15, 2010
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The dumbass way some dyslexic and drop outs think kill joy is pronounced
Chee boe you dropped my chop bowl you’re a joy kill
by slobski on my chopski April 9, 2022
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A small band from the central Florida punk scene
Have you heard mila by Kill The Joy?

Yeah! Are they gonna make more music?

I have no idea.
by GarbJunky79 December 5, 2022
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A guy who, due to ego or low intelligence, refuses to acknowledge that he didn’t get understand the joke, so instead resorts to insisting that there was never a joke in the first place. He will often criticize the intelligence of the person telling the joke on the basis that they were serious.
“Make sure not to use satire around that guy! He’s Dunning-Kruger’s Kill-Joy, he’ll trap you in an argument you never actually made!”
by CountSnoww November 18, 2021
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