The number of different people one has had sex with
Guy 1: I fucked that chick last night. Now I have four kills.
Guy 2: Nice!
by dudewheresmylatsyrc December 27, 2009
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1. To destroy the perpetual funnyness of something funny by use of a lame, moronic comment.

2. To get a powerful ammount of positive feedback. Often used in comedy, Rock and Roll shows, and anything else stage related. Popularized by Manowar.

3. To unplug or turn something off.
1.
Person #1: Are aces high or low?
Person #2: They go both ways.
Person #1: Hahaha.. he said they go both ways.
Person #3: Hehe..
Person #4: Like a bisexual.
Person #1: *stares*
Person #2: Yes.. That was the joke.
Person #3: You killed it.

2. "The whole purpose of playing live is to blow people's heads off,". "That's what we do; that's the energy of this band. We're out there to kick ass. We're out there to turn our Joey DeMaiogear on and blast. We're out there to kill. That's what metal is. Anybody who says otherwise is not playing heavy metal. We will melt your face!"
- Manowar bassist Joey DeMaio

3.
Highway Patrolman: Kill it.
Driver: *turns off the engine*
Highway Patrolman: License and registration please.

or

Guy #1: Kill your PS2 so we can play Super Smash Brothers Melee.
Guy #2: Hold on you pushy bastard.. I'm trying to play Snake Eater here.
*pointless game debate ensues*
by Barry the fucking PIRATE. September 14, 2005
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Used as a reaction when something is funny.
Person#1:Fuck your fat head, long neck, lil body ass!!

Person#2:(Laughing)...KILL!! That was funny as shit!
by Imanitite July 30, 2008
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Reference to Axe's double pits to chesty

To "kill" something you need to do it very well. After accomplishing something with great efficiency you are recommended to pump your fist to show people around you that you "killed it" also to signal people from a far distance that you killed it.
After getting test back with A+ "Killed it" *pumps fist*
by austins c00l August 19, 2009
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1. When someone says or does soemthing to destroy the current flow of rich interaction.

2. When someone does something or wears something that is too sensational to describe.
1. Someone tries to do "the macarena" at a hot dance.

2. "Ey yo, you killed it when you stole that nigga's toaster."
by Kakeson March 31, 2005
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