A misspelling of the word "retard" that means the same thing. Also a way to censor "retard" or "retarded" in a way that is publicly accepted as "retard" is seen as somewhat offensive.
the restart elite is an elite that exists only in halo: reach. it is an elite that does not wear any armor and is armed with only a combat knife, is invincible and can kill you in one stab and makes you restart the entire campaign(hence the name restart elite) you can usually tell that he is making an attack by the disturbed song indestructable before he enters the game. his appearances are extremely rare. also, he deranks you to recruit and takes away your armor and credits.
An obsessive-compulsive need to retry a (video) game every time one messes up on it. Usually done when one is attempting to break a personal record, and has committed a mistake that impacts the chances of breaking it.
This is like the 1,000th time I've restarted Tetris Sprint. I've got a serious case of restartsyndrome.