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. December 10, 2007

by JENNA January 01, 2004

1. The involuntary emotional response your body goes through when a person hears or sees a loved one. 2. The shared gratification of a smile or feeling of elation between two or more friends or family. 3. All things that bring upon a person the spontanious feeling of joy! -Grandtastic- is the combination of grandiose & fantastic. Always a pleasant or joyful experience.
I talked to my baby today, it was grandtastic!" or "I made my kitten smile today, that's grandtastic!" or "My newest tattoo is grandtastic!
by Joseph R. Conway/Shadespiller August 06, 2011

Better than Fantastic. Even more grand. Basically a twofive on a scale of one in the fantastic department. But not quite a twofive bc twofive.
Subject A: "I just got a new kitten!"
Subject B: "Oh really? Dang aw how exciting.. Wait.. is it black.."
Subject A: "HECK NO NOT BLACK CATS OH NO"
Subject B: "OH WELL THEN YEAH! KITTENS YES! WOW THAT'S JUST GRANDTASTIC."
Subject B: "Oh really? Dang aw how exciting.. Wait.. is it black.."
Subject A: "HECK NO NOT BLACK CATS OH NO"
Subject B: "OH WELL THEN YEAH! KITTENS YES! WOW THAT'S JUST GRANDTASTIC."
by treehugger345 August 17, 2016
