Incorrect spelling of the word "It's."
Commonly seen amongst the Halo community, often used by people who have the mindset that they are MLG Pro, and will step to any noob who thinks they can win a 1v1 match.
"Hey man, I'm going to make a new gamertag...any ideas?"
"Nah man that's gay. How about iTz HardAzz?"
"That's good. Make it iTz HardAzz v2 though"