a person or thing that kills.
a device used by a post office for printing cancellations on postage stamps.
a mark of cancellation made on a postage stamp.
Slang. something or someone having a formidable impact, devastating effect, etc.: The math test was a real killer.
adjective Slang.
severe; powerful: a killer cold.
very difficult or demanding: a killer chess tournament.
highly effective; superior: a killer recipe for fried chicken.

1525–35; kill1 + -er1

self-killer, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
killer (ˈkɪlə)
1.  a.  a person or animal that kills, esp habitually
 b.  (as modifier): a killer shark
2.  something, esp a task or activity, that is particularly taxing or exhausting
3.  (Austral), (NZ) an animal selected to be slaughtered for food

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

killer definition

  1. n.
    a marijuana cigarette. : How about a killer, Wilmer?
  2. n.
    a very funny joke. : She told a killer about a red-nosed juicer.
  3. n.
    something extraordinary. : That car is a killer. I like it!
  4. mod.
    extraordinary; great. : What a killer jacket you're wearing!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences for killer
Some authors have argued that he was the serial killer known as jack the ripper.
Every member of both gangs was always a potential killer even then.
Kitten is the spoiled daughter of killer moth and the girlfriend of the mutant
Labelling himself a rapist and now a killer, jack once again began pushing
  jennifer away.
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