Something that is superterrific is really, really great or excellent.
Superterrific is a very happy and positive word.
Examples:
The party was superterrific!
I had a superterrific time at the park.
She got a superterrific present for her birthday.
The cake was superterrific, I want more!
I had a superterrific dream that I could fly.
The superhero's powers were superterrific!