You know those times when you're trying to help someone out but they're so amentistic that they can't see basic logic and sense. The kind of people that make you want to slit your abdomen so you don't have to breathe the same air as them. The kind of people who make you feel like you've lost brain cells after talking to them.
A combination of awesome, fantastic, and legendary to describe something so incredibly epic that no one single word alone can possibly describe it and this term must be used. Should be used sparingly because there only so many things that incredibly awesome.
Winning those twelvegames of beer pong in a row was so awetastindary.