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verb. A crack in the ground. A crack in the ground. The definition of crack is a sudden, sharp breaking sound or a break in something. 1  An example of crack is the sound of a bone breaking.
Crack is the hard form of cocaine that develops when the drug is mixed with water and other solvents and then cooked into a hard, rock form. The drug is still highly potent, very powerful and extremely addicting despite the chemical changes that take place when it is cooked.rack is a mixed and cooked, rock form of cocaine. According to the National Library of Medicine, crack cocaine is a rock form of cocaine that appears similar to broken white rocks. The drug is not quite as hard as a rock and actually has a density slightly greater than candle wax.