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8.
Of or relating to heroin addiction
I can't go to work cause I got the sickness.

Geenie got the sickness...she been shooting it into her eyeballs man.
by damn_fool July 19, 2006
 
9.
Really good amazing marijuana. Very High Queality
I love to smoke the Sickness.
by The Sickness March 11, 2005
 
10.
'the sickness' is what your clothes get when you wash them, but fail to hang them out until the next day. Once they're dry, they smell faintly like sick.
About to meet his date, Kevin froze as he realised the smell of vomit was coming from his freshly-washed shirt. "Damn, my shirt's got the sickness".
by heathen September 03, 2004