Crack has two definitions (that you want to know about:-). The first
definition of Crack is the drug, which puts our body and mind into an emotional high. When the drugs wear off the crack then puts our bodies into a negative emotion, therefore making the
stoner want more.
The second
definition of a crack is a specialized software or patch that modifies another software (or game, etc) so it can perform illegal functions that is not allowed or prohibited by the rightful publisher. A crack/patch can modify a trial version game and convert it to the actually full game. Any programmers who develop cracks and give them to the public can programme a crack to extend or unlock a executable file without having to buy it.