Halo-killer 

A very high-quality shooting video game.

Many say that Gears of Wars will be a Halo-killer.

Halo-killer by Deacon Brandt November 10, 2008

Halo-killer 

A console video game (a first-person shooter specifically) which is better than, or claims that it is better than, the games in the Halo franchise. Perfect Dark claimed this and failed, Killzone claimed this and failed. Call of Duty 4 is indirectly claiming this and might fail. No game has yet been able to claim the spot of being better than Halo, and to claim to be a halo-killer pretty much destroys any slim chance they might have had.

"Dude, Perfect Dark is gonna be a Halo-killer."
"No, it's not, you are wrong, asshole, Perfect Dark blows."

Halo-killer by sparkles mcgee October 22, 2007

Halo Killer 

A term used to describe video games in the FPS, First Person Shooter genre, that are believed to be the next big thing since Halo Combat Evolved.

Haze was hailed as a halo killer before its release.

Halo Killer by Falcon_gamer January 12, 2009

Halo Killer 

A game which is determined better than the infamous halo game by the gaming community. Not doom.

Connor: “hey are you playing doom?”
Steve: “yea it’s a total halo killer”
Connor: “ No the fuck it’s not”

Halo Killer by I_like_dinosaurs June 5, 2020