by mickmickman July 03, 2008

1: Someone who ruins someone else's fun.
2: A fan of the progressive 90's Canadian punk band, The Killjoys.
2: A fan of the progressive 90's Canadian punk band, The Killjoys.
1: Max took the band out, and Conan the killjoy got peeved, and screamed at them. The party was ruined.
2: "Today I Hate Everyone" is Kev's favorite song, he's a total killjoy
2: "Today I Hate Everyone" is Kev's favorite song, he's a total killjoy
by cheeseplaydoh August 11, 2004

by glittergerard June 15, 2015

by Mr. Chad Allen October 24, 2007

by rabidwalrus November 04, 2009

A name for people who suck the life out of things with either lame comments, or just their general presence.
I was having fun until Buzz Killjoy over there came over and ruined everything.
Buzz Killjoy ruined my high.
Buzz Killjoy ruined my high.
by MaseDiggityDawg March 10, 2010

Comes from My Chemical Romances album (Danger Days - the true lives of the fabulous killjoys) concept. The killjoys, Party Poison (Gerard Way), Fun Ghoul (Frank Iero), Kobra Kid (Mikey Way) and Jet Star (Ray Toro) are fighting against the evil Better Living Industries in California, 2019. Korse is the bald guy in charge of BLi, with the Draculoids as henchmen. Other killjoy types, such as Dr Death Defying, are in league with Poison and his gang. The music videos for Na Na Na (Na Na Na Na Na Na Na Na Na) and Sing are based on this alternate reality.
by Frankietheninja February 04, 2012
