Alpha killer 

In a group of people the alpha killer is the person taking underdog. When the right moment comes, he will challenge the alpha male of the group and come out victorious because of sheer ability/wit. This effectively embarrasses the alpha.

That guys is a real alpha killer. You know what they say, it's good to be the biggest sheep in the herd, but it's even better to be a wolf.

Alpha killer by CCChinoy July 30, 2014

Schoolie Killer 

A person who commits genocide by to the nasty free lunch provided by the New York City Department of Education by eating three plus trays.

As I entered the lunchroom, Marlee begged for my schoolie and when I asked him why, he said, “Because I’m a schoolie Killer”.

Schoolie Killer by Marlipia November 26, 2019

Hunter Killer Drone

It's a scorestreak in the game Call of Duty: Mobile. It's a small drone which is launched into the air, and it will target enemies on its own and rushes towards them and kills them. It's not manually controlled by your player, you can just launch it into the open and it itself will go and kill enemies. It requires 500 points to use. It can be very annoying as destroying it mid-air is basically impractical.

Johnny: *is on a 19 kill streak* Omg I'm so close to a nuke!
Enemy team player: *uses Hunter Killer Drone*
Announcer: Hostile Hunter Killer Drone inbound.
Johnny: *ignores the announcer.*
Hunter Killer Drone: *targets Johnny and kills him*
Johnny: MY KILL STREAK IS RUINED BECAUSE OF A STUPID DRONE....FUUUUCCKKK!

Hunter Killer Drone by Cool_Fox February 19, 2020

Boomer killer 

Another word for coronavirus. Old ass niggas die from this virus. These specimens have the weakest immune system I have ever seen.

Oh shit grandpa got the boomer killer. He shouldve never went to Wuhan.

Boomer killer by Bigoscarkong March 17, 2020

Stone Killer 

One who kills without feeling.

That Chuck Bronson is a stone killer.

Stone Killer by gettin the vig June 11, 2011

Zodiac Killer

Ted Cruz

Ted Cruz its obviously the Zodiac Killer...

Zodiac Killer by Ahoeness August 6, 2016

kennedy killer 

Also known as a PA-32 Piper Saratoga aircraft, known as such in reference to the aircraft John F. Kennedy Jr. fatally crashed. Also a reference to any aircraft flown that is within the pilot’s financial capability to own, but that its complexity is beyond the pilot’s skill and experience level to safely fly.

Immediately after that lawyer got his pilot’s license, he went right out and bought a Kennedy Killer.

kennedy killer by Teflon March 2, 2006