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.

To merc people in Halo hard.
Killing 4 or more people in rapid succession.

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

A term said by the Halo 2 announcer when a player kills four players in a row in very rapid succession.

1. Getting 4 kills in 4 seconds in the Halo: Combat Evolved or Halo 2 video games.

2. Something impressive or spectacular.

3. ownage.

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