1)someone or something that literaly or metaphoricaly kicks ass
2) someone or something that causes great damage to anything it comes in contact with.
3) a large angery person who scares the shit out of you
4) a tremendously effective implement of destruction, usually a weapon
5) something someone declares themselves after kicking ass
stay away from that big guy over there, he's a murder machine
yo, that 1911 i just bought is a murder machine
(while standing over your half dead opponent) I Am A MURDER MACHINE!
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