In Halo video game series, when you kill 4 opponents within 4 seconds of each other. When someone gets a killtacular, it is announced to that player by the Halo announcer.
The announcer in Halo yelled "Killtacular!"
by Zach Dorsett October 5, 2005
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1. Getting 4 kills in 4 seconds in the Halo: Combat Evolved or Halo 2 video games.

2. Something impressive or spectacular.

3. ownage.
by CalibMatlock August 10, 2006
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1: The sound made when you have killed 4 or more people in a short amount of time
2: Severe ownage
3: Sound I make when I kill people
Ha you got owned! I was shoving hte killtaculars down your throat!
by BondageBoyo August 15, 2004
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The Killtacular is not just a medal from the Halo series, but it is also a sex move! The act of placing your thumb on her clitoris and smoothly massaging it while inserting your index and middle fingers in her Vagina and caressing the G-Spot. Next place your last 2 fingers (ring and pinky) into her anus. Meanwhile massage her boobs using your remaining hand while you are making out with each other preferably in the 'Deep Thrust' position. This type of sexual gratification will surely make any lady squirt with glee and quick lee! This is pretty much the 'Shocker' on steroids.

As a bonus, you can add to this by pinching her nipple while fondling her boobs with your leftover hand and French-kissing her as well. That is called the Killimanjaro!
shocker sex fuck intercourse getting laid KIlltacular Killimanjaro
by Jet the Pirate May 7, 2017
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To merc people in Halo hard.
Killing 4 or more people in rapid succession.
I hear killtacular a lot when I play
by SirHumpsAlot July 3, 2003
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Derived from an award on Halo whereby the player gains 4 kills in rapid succesion *aka they pwn you real bad*

Now an online synonym for anyone who dishes out the pwnage big time
pwnage! that was KILLTACULAR!
by Arrow January 8, 2005
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A term said by the Halo 2 announcer when a player kills four players in a row in very rapid succession.
"you coax, what does killtacular mean?"
"It's like the thing you do with underage teens, 4 in a row, 4 seconds between"
-Futuristic sex robotz
by Zakkkk December 1, 2007
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