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
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A Shiny game "M.D.K." for Windows/MS-DOS, Mac OS and PS1 whose name was inspired by Demolition Man movie (1993). In fact the "M.D.K." name might mean "Mission: Deliver Kindness" as it was mentioned in game manual, but who cares?
- Dude, I Murder Death Kill all night. Shiny was f****ng awesome those days, Earthworm Jim and the like!
by GGLapkizzz February 19, 2021
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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 13, 2007
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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 30, 2006
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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 3, 2004
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when you hurt in 3 places physical world ,spiritual world and, virtual world,
quoted in the motion picture demolition man
he got murder death killed "abdi, abdi, thats all folks
by greaseaphobe October 19, 2021