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

Another way of saying brilliant,or a description of something awesome as opposed to its real meaning, sick is a compliment.

Originated in Detroit, Michigan (possibly the Eastside).

Used when one is excited or surprised of someone else doing great things. Also can be used when one is shocked about something.

The worst match up in the world between slutty Selena Gomez and amazingly talented Nick Jonas. Although they dated for quite a while, everyone knows that Selena was Nick's bounce back girl after he broke up with Miley Cyrus. Sick is sometimes referred to as Nelena, but most people like to think of it as SICK.

if it is sick its toatally awesome

Something absolutely cool but to cool to say cool so you say Sick!!! Often Ahhh is put infront of sick.

depending on the context it can mean a number of things.1 awesome,2 Disgusting or 3 just feeling not well