Dude, that snowboarding 360 aerial flip was sick!
|Off the hook||Totally awesome|
|Beast||An awesome person|
|Bada**||A cool rebel|
|Straight fire||Very cool|
Sick is slang for "cool," "rad," or "awesome." For example, if someone says you have "sick moves," that (more than likely) doesn't mean your dancing prompted them to vomit. Rather, it means they think your dance moves are pretty great.
Following roughly the same trajectory as wicked, sick began being used to mean "cool" sometime around the 1980s. In the 80s and 90s, sick was most often used by skaters, surfers, and teenagers. Many people think skaters are primarily responsible for sick's additional definition, which arose from skaters using the term to describe mindblowing cool tricks that others needed to be "sick in the head" to attempt.