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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!
Killjoy by iLikeWatermeons33 November 28, 2012
Someone who infringes on your trips, man.
Me: *Smoking a bong*
Mom: No way, my child.
Me: Shut up biotch, don't be a killjoy.
killjoy by rabidwalrus November 4, 2009
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.
Killjoy by Pissedofffacebookguy March 14, 2011
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!
killjoy by EvilMuse April 12, 2005
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.
Killjoy by †wiligh† November 21, 2007
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
killjoy by GoodGuyJayce May 11, 2019