Gee-Whiz:
To express surprise  

“Gee Whiz , Charlie, I never thought fizzies would be this good.”

Neat-o:
To describe as cool

Gee Golly:
To express surprise

"Gee Golly , Fizzies are sure neat-o."

Dibs:
To stake a claim

"Hey, I've got dibs on the last package of fizzies."

Word from the Bird:
The latest information

“The word from the bird is that Fizzies are back.”

Cut the Gas:
To keep quiet

"Gary, cut the gas , I'm tryin' to enjoy my Fizzies back here!"

Radioactive:
Very popular

"Watch out, Fizzies are radioactive."