Snape killer 

A person who kills another person from the opposing side, to gain the trust of their master, just to bring them down.
For example, Severus Snape killing Albus Dumbledore in the Harry Potter series to gain trust of Voldemort

Snape is a snape killer, he killed dumbledore just because of that!

Snape killer by JariPinda March 16, 2017

snape killed 

Killing someone you are truly loyal to convince your evil overlord master that you are loyal to them

Kylo Ren snape killed his dad Han Solo

snape killed by KrazyCitty June 3, 2016

snape-killed 

Killing someone to deceive your dark overlord into believing that you are their ultimate agent.

"Would you believe me if I said he snape-killed him?"

snape-killed by SuperCarlinBrothers, Fan October 10, 2016

Snape killed Dumbledore 

An expression inspired by the 2005 internet fad around the Harry Potter and the Half-Blood prince in which the character Snape kills Dumbledore.

"Snape killed Dumbledore" is closest in meaning to shit happens or I don't give a shit and is is used as an unsympathetic comeback, similar to Jesus wept.

Guy 1: "Balls. I just failed another Calc test. Another, and I'll fail the class."
Guy 2: "Snape killed Dumbledore, you know? You always complain about failing classes, why don't you study for once?"

Snape killed Dumbledore by Ben Dover! May 26, 2006

snape-killed 

to kill a loved one or some one of great trust to trick your evil over lord to believing you are their right hand man only to help their enemy over throw them.

Kilo Ren snape-killed his father to trick smoke in to believing he was his servant.

snape-killed by deathwind666 December 18, 2017

Snape-killed 

When you kill your alie to prove your loyalty to your dark overlord who you are a tripple agent of.

Snape Snape-killed Dumbledore.

Sorry for spoilers

Snape-killed by Ann O'nymous April 24, 2018

Snape-killed 

Killing someone to deceive your dark over lord that you are faithful

I snape-killed Becky to trick my bitchy best friend that I

was faithful

Snape-killed by sophiotaurus January 17, 2018