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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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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.
I got a crack for Photoshop last night.
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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20
1) In a nutshell, a highly addictive drug that is a combonation of two parts coke to one part baking soda heated to become one solid entity. Usually smoked through a crack pipe and has serious health threatening side effects.

2) The line between your butt cheeks. Often Exposed when one bends over while wearing pants that do not fit right!
by Amy O'Connor March 25, 2007
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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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