short for ituned out and means you have listened to the same songs/song for a long time on itunes that you are sick of it and need a new song
when you suddenly space out and go to the TW (twilight zone(a place where you suddenly can't think of anything but one thing for a shot period of time. usually not what you should be thinking of)) but this is for a longer period of time.
jeff: i am ITO dude, i need a song, any suggestions?
mike: no, not one.
brett: ITO, for like 15 minutes during science to day, what are we supposed to do for homework?
sierra: we didn;t have homework