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Someone (usually Michael S.) who enjoys needlessly pointing out logical flaws by responding to internet conversations (that they weren't originally included in) with copious amounts of obscure (or useless/stalkerlike) information
Adam: "yeah, according to this list, the **** champs are ranked 22nd...that can't be right"

Mike: (ignoring **** reference) BLAHBLAHBLAHBLAH I SURF FORUMS ALOT AND LEARN ABOUT OTHER TEAMS THAT I'VE NEVER TALKED TO NOR COMPETED AGAINST BLAHBLAHBLABLAH THIS IS WHY YOU'RE WRONG BLAHBLAHBALHABLAH

A: You're a killjoy.
by Pissedofffacebookguy February 27, 2011
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29
KillJoy Radio where the web will kick your ass!!. Can be found easily by going to the shoutcast site and searching for KillJoy. Also found onirc on undernet #killjoy.
Killjoy Radio, don't let the name fool ya!
by EvilMuse April 12, 2005
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30
An idiot or someone so stupid they can't open a door.
Killjoy, you're suck a fucking retard... use google if you can't find the game.
by †wiligh† November 01, 2007
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31
One who make joy in killing.
Pleazent Killjoy!
by HINUZVAGETA January 21, 2021
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32
A shitty agent in valorant, that has op traps, and an annoying ass turret.

riot, you dumfucks, nerf this piece of trash to the ground
ur such a Killjoy uh
by retardedpotago September 09, 2020
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33
asshole/s who ruin your best friends funny joke
Guy 1: And he was like laughing so hard
Guy 2: *chuckles*
Guy 3: your joke is so ugly as hell
Guy 1 and 2: what a pathetic piece of killjoy garbage
by GoodGuyJayce May 11, 2019
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34
speaking from experience here: a feral dumbass. with good music taste tho. probably a scene kid and/or emo
"Hey, you know that kid in math class? Xe said something was 'fuckin milkshake' and I have no clue what xe meant."
"Oh, yeah, xe's a killjoy. Xe just thinks it's awesome."
by salemruinseverything September 12, 2020
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