16
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 March 14, 2005
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17
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 May 20, 2007
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18
A small, illegal program who's sole purpose is to trick another program (by editting, imputting a registration key, or some other method) into thinking it has been registered.
by Invalid H. User April 23, 2003
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19
The area between the ass cheeks and, in females, including the crevices of the genitalia.
Her thong was pulled so tight up her crack, you could see her asshole when she bent over.
by Peter Purfle March 19, 2003
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21
In computers, a program that modifies the code of another in order to bypass copy protection techniques. Cracks are often applied to trial programs or programs requiring product activation.
My copy of Windows didn't activate so I downloaded a crack and now it works.
by computer_guy February 16, 2008
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