Definition of "sicko" [sicko]

• Slang A deranged, psychotic, or morbidly obsessed person. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "This sicko is actually arguing for torture in polite company."
• "I would advise ALL OF THEM to head for Canada until the sicko is outta the white house and behind bars!"
• "And when some smarmy clueless sicko is watching you do this while asking you why it takes so long to count some pills and put them in a bottle, I can imagine the veins popping out of the pharmacist’s head now."