Cracked is a term used by gamers, referring to someone who is very good.
Likely originally derived from being on the drug crack cocaine, as that drug often seen to increase performance in mental tasks (such as video games, or programming, two things that are often done by the same people).
To mean you got something totally correct or you completed something perfectly.
Synonyms: perfected, completed, aced, nailed
Most commonly used as a past tense verb.
The motion that usually accompanies the word is holding your hand above your head, and dropping it until it hits your head and then fan out all of your fingers and drop your hand over your face. This motion is supposed to resemble cracking an egg on your head.
to be a regular user of hard drugs such as cocaine, meth or heroine. It is often used to describe an addict. It can also be used to describe someone who fiends often