1.) An error in spelling that makes it impossible for the word to be deciphered.
2.) Someone who makes many spelling errors, either because they are truly stupid, or because they are typing too quickly.
Carjak: "ho wdid u doin u race"
Interpretation: "ho, did you doing you race?"
Reponse: "YOU CALLIN' ME A HO?!?"
Wow, Emma is such a carjak. She IMs people all the time in her fragmented nine-year-old English.