When your throat, mouth, and tongue all dry out and you need to rank a big drank. The sickness can only be cured by any type of alchoholic beverage in large quantities, but mainly purple drank or jungle juice should be used.

OLD VERSION OF SICK

Pronunciation: 'sik
Function: adjective
Etymology: Middle English sek, sik, from Old English sEoc; akin to Old High German sioh sick
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1. Not feeling good.

2 a (1) : affected with disease or ill health : AILING (2) : of, relating to, or intended for use in sickness <sick pay> <a sick ward>

NEW VERSION

Now used as the newest word to replace cool. Something that you've never seen before.

Cool or entertaining to a nausieating degree.

wonderful, awesome, great, incredible, amazing, impressive, dope, cool, sweet...

other variant: SICK-ASS
(-ASS= a redundant extension duplicating the definition)

sick as in ill or doing something cool skiing or snowboarding slang like doing a sick rail

When someone you're dating/an ex, suddenly starts making you feel sick. Usually associated with their smell, The Sickness eventually results in completely unavoidable physical repulsion.

if it is sick its toatally awesome