Kristal Joint PCP
A term for the drug PCP
by k September 15, 2003
the dopest
damn, you're the KJ
by mister September 16, 2003
abbv. killjoy / kill joy Australia

A person who wishes to not socialise and have fun, therefore 'killing' the fun, or 'joy' of others
Jane: "Amy you gotta come clubbin..."
Amy: "Nah... I'm tired... I don't want to go"
Jane: "But everyone is going..."
Amy: "Nah..."
Jane: "Oh my god you're such a KJ!!"
by Cho Chang May 27, 2004
a sweet talker, breaks hearts as easily as he can mend them. You never know if you're going to have a broken heart or a mended one. He can be so sweet when he wants to be. You think he'll always be there for you, but then in a second he can vanish.
The more Kj rejects me, the more I want him!!
by superbored June 06, 2011
most widley used in the video game world, as kill jack.
also known as a kill steal but you cant yell KS and sound too cool, KJ is the act of killing someone who is already hurt.
by johan ciznero December 19, 2009
or "koala job"

to suspend yourself from a woman's torso in a 69 position and recieve a blowjob but give nothing in return thus resembling a koala.

eating her out while shes hanging from you is a reverse kj.other variations include k69, and the koala toss
yo son i just got this ill ass kj but it blew my girl's back out!!
by hoor3x January 17, 2007
A "KJ" is a knee jerk. These are the people that react/overreact to a person/place/ or thing without knowing all the facts. They are quick to judge anything and anyone and have little to no regards for actual facts. They are the headliner chasers of the world.
"Why is he freaking out over that? Doesn't he know the Onion is fake?"

"He's a KJ. They don't know any better."
by Canadian Shield July 18, 2014

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