sick

Definitions

General English

Military

  • adjective suffering from an illness or disease

Slang

  • adjective amusing, funny. An item of black street-talk which was included in so-called Ebonics, recognised as a legitimate language variety by school officials in Oakland, California, in late 1996.
  • adjective excellent. Used as a vogue expression of enthusiasm by e.g. skateboarders, and usually self-consciously or ironically by students since the 1990s.

Sports

  • adjective used for describing a move that is performed so skilfully as to cause envy

Origin & History of “sick”

The ultimate origins of sick are a mystery. It has been traced back to a hypothetical prehistoric Germanic *seukaz, but beyond that nothing certain is known. Its modern relatives are German siech, Dutch ziek, Swedish sjuk, and Danish syg.
http://www.dictionarycentral.com/definition/sick.html