1 definition by Autumn K.
adj. a combination of "grand" and "fantastic" used to describe extraordinarily wonderful or exciting happenings
1. I just know the dance this Friday is going to be grandtastic!
2. I got an A on the test-this is grandtastic!
3. Isn't it grandtastic that our team just won the championship?!
2. I got an A on the test-this is grandtastic!
3. Isn't it grandtastic that our team just won the championship?!
by Autumn K. November 14, 2007