This is an expressive word, to describe, it can be used in a sarcastic tone or even a happy emotion. depends on the user of the word. the word originated by Brea Braun and was quickly spread among teenage lengo. It is a combonation of the words Fantastic and Ass, to express emotion far beyond the means of being Fantastic
Jim: hey, hows it going Bob?
Bob: I am fandittlyasstastic! thanks for asking!
Jill is discussing her last date with Tom
Jill: our date was fandittlyasstastic