Sick-o originated at or was at least popularized in Oakville, Canada. It's variations include sick-ass. It has the same meaning as sick, only slightly better.
Yo man, that concert was sick-o!

Cheerleading is sick-o!
by DefinitionGuru3597043057293 August 08, 2005
A man aged over 18 attempting to seduce a vulnerable 15 year old overexcited at sneaking into a venue serving alcohol.
An Adult hitting on a 15 year old girl, what a "sicko"
by frothies May 16, 2011
when u get fuckin sick of everything, everyone and all that has to do with ur surroundings
im so fuckin sick-o everything!
by Namdor11 March 29, 2006
Friends that send other friends terrifying videos to derive sick pleasure from their fear. Often have long blonde hair, short shorts, and boyfriends whose last names rhyme with Beagle.
Davidinsobrah: Hey, did Laura send you that link?
Stefanocus: She sure did! What a sicko!
by DefinitelyNotChloe February 24, 2013
Fart with the nastiest smell imaginable.
J: "who's dropping SICKO'S in here"
by Terryfunksasshole January 06, 2012
A feeling of pure elation. Better than the commonly used sick. Could be used to describe something you have done personally.
"Man, did you see that goal last night, it was sicko !"
by JNeewwmmaann August 19, 2009
A propaganda film by Michael Moore that tries to show how bad the American health care system is though slander and exaggerations.
Sicko uses rare cases and implies that that is the norm.
by Davis Finch June 29, 2007

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