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1.
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?!
by Autumn K. November 13, 2007
 
2.
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 05, 2011
 
3.
1) expression of a positive.
2) an adjective to praise an object, being, feeling or event.
Last Christmas was grandtastic.
by JENNA January 01, 2004