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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."
Killjoy by MadamexXx February 26, 2009
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Killing It

To ruin or mess up by doing something annoying. ("killing a high")
Stop f*ckin around man! You're killin' it!
Killing It by Nancy December 8, 2004
Related Words
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
Killjoy by Chris000 January 17, 2008

convo killer 

a convo killer is possibly the most evil killer of all. after you write a page worth of shit on msn they will respond with a one word unrespondable answer that leaves you thinking "FINE FUCK YOU THEN" but this isnt it the worste thing about these fuckers is that after they palm you off with a shit responce that leaves you dishearten 10 mins later THEY will say something like wuu2. If they dont do that they aint a convo killer ...they probably just dont like you.
fucks sake you evil convo killer bitch you gave me a 1 word reply now your saying wuu2 DA FUCK you think im up to im on msn i aint out there solving world hunger am i?! you fucking idiot.
convo killer by WHU4LYF October 10, 2008

killed it 

got a good joke or something close going and someone jus says something hella outta line and it jus kils tha joke
we was baggin on tre's mommas booty and shawn killd yo!
when someone is doing something really annoying or stupid, etc....
man quit punchin me, ur killin.
or he was killin with the tests today
killin by africaliberia March 31, 2009

dancefloor killer 

a dj that mix shitty music and makes all the people leave the dance floor to do something else
dude#:1the party was awesome everybody was dancin like crazy till "Dj shit" arrives putting his shitty breakcore

dude#2:"dj shit" is always the dancefloor killer
dancefloor killer by Aeonion March 25, 2009