1 - Something that is freakin awesome as compared to huge boobs.
2 - Something that gives you an intense pleasure.
3 - Used to describe a woman with large boobs.
Person 1: That was a great cheeseburger.
Person 2: Yea, it was titastic.
Person 1: Check out the chick.
Person 2: WOAH she is titastic.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi