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[sik-oh] /ˈsɪk oʊ/
noun, plural sickos. Slang.
sickie (def 1).
Origin of sicko
sick1 + -o Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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British Dictionary definitions for sicko


noun (pl) sickos
a person who is mentally disturbed or perverted
perverted or in bad taste: sicko prurience
Word Origin
C20: from sick1 (sense 5) + -o
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for sicko

1977, from sick (adj.) in the mental sense + ending as in weirdo. Sickie "a pervert" is attested from 1972, and cf. sicknik (1959) "pervert, obscene comedian" (applied to Lenny Bruce), with fad ending -nik.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for sicko



  1. (also sicko or sicksicksick) Mentally twisted; psychopathic, esp in a sadistic vein: a rapist or a sicko father who abuses his teenage daughters (1551+)
  2. Disgusted; surfeited; fed up: Sick to the gills of the Simpson trial? (1853+)
  3. (also sicko or sicksicksick) Gruesome; morbid; mentally and spiritually unhealthy: Label it S for Sicko/ He is even better at establishing a sicksicksick atmosphere (1955+)
  4. Needing a dose of narcotics (1940s+ Narcotics)


The craving and misery of an addict in need of a narcotic dose (1940s+ Narcotics)

[modern use of first sense from about 1955 is probably not a survival]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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