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3.
Murder-Death-Kill is the name of a rap song by 7L and Esoteric, featuring Demigodz associate Celph Titled. Available on the album DC2: Bars of Death. Eso and Celph rip this track up, some of the dopest gangster shit you'll hear. Or at least Celph's verse.
Eso: It's murder-death-kill
Celph: Or it's kill death murder
Eso: Celph push they wig back
Celph: ES push it back further
Eso: You comin out your face?
Celph: We handle beef to the bone marrow
Eso: No matter if it's Demigodz
Celph: Or Army of the Pharaohs
by ramzacloud October 29, 2006
 
1.
Murder Death Kill was a term coined in the 1993 action film Demolition Man. The term was used to describe a homicide. The film was set in an age where homicide was a very unusual thing, which is presumably why the term iterates the fact repeatedly.
Taken from the Demolition Man film:

"We can just wait for another code to go red. And when Phoenix performs another Murder Death Kill, we'll know exactly where to pounce."
by Adam Pollock April 30, 2007
 
2.
From the movie Demolition Man, starring Sylvester Stallone and Wesley Snipes. It was repeated, along with a police code (1-8-7) over police scanners when Wesley Snipes' character had escaped from cryogenic prison into a crime free society, where he perpetrated many murders.
Police Scanner: Code 1-8-7. Murder-Death-Kill.
by Hexadecimal April 12, 2007
 
4.
From the movie demolition man. Said in context of something being particularly bad for you.
Try this bacon lard cheese dip, it's murder death kill.
by JenThe80'sFan May 03, 2004