a now obsolete adjective popular as a business buzzword among yuppies in the early eighties. It described a worker who was very smart and very fast-paced. This meaning of "crack" was forced out by the drug, crack, in the mid-eighties. Sort of like you can't say "gay" to mean "happy" anymore.
That was a good move to hire him; he's crack.
By Dr. Heywood R. Floyd
Another form of cocaine: 2 parts cocaine to one part baking soda, with a little water, heat gently until a precipitate forms: this is your crack
Why do cokeheads think they're better than crackheads?
By urchin
to have sex with a girl
I cracked on the shawty Melissa earlier I'm trying to crack on that one girl right there
By DaWvyBoy
The word originates from the Anglo-Saxon term, "crack" meaning fun. It possibly dates back as far as Old English or the older Scots dialect and is still used today by Ulster-Scots in Northern Ireland. Borrowed by the Gaelic Irish and spelt "craic", the term has been picked up by UK journalists in recent years and has re-entered the use of the word (Hiberno-English) in mainland UK. Dublin journalists in the 1970s frequently spelt the word as "crack" in written articles.
What's the crack? Aye it was good crack! To crack a joke
By GoonerGary
1. freebase form of cocaine, generally smoked in a crackpipe 2. the crevice between one's butt cheeks.
"The Customs officer stripsearched Oprah and found forty pounds of crack."
By Joe Bone